Some hot spots produce volcanoes. The more heat and pressure you add, the further the rock metamorphoses until it becomes gneiss. Then, due to various conditions within the Earth, the existing rock was changed into a new kind of metamorphic rock. state of matter with no fixed shape that will fill any container uniformly. Washington, DC 20036, National Geographic Society is a 501 (c)(3) organization. Consider how granite changes form. process that occurs when water is added to hot, solid rock, lowering its melting point and allowing the creation of magma. What is weathering and … Because the foliated metamorphic rock slate splits easily into flat pieces, it is used for ------. Form igneous rocks become changed, or metamorphic—can become a metamorphic rock from! Gas molecules are in constant, random motion. Tags: Question 26 . Magma can intrude into a low-density area of another geologic formation, such as a, Plutons can include dikes and xenoliths. They are formed on or near the Earth’s surface from the compression of ocean sediments or other processes. having parts or molecules that are packed closely together. Metamorphic rocks are formed from other rocks that are changed because of heat or pressure. rock cycle . If you have questions about how to cite anything on our website in your project or classroom presentation, please contact your teacher. It forms in high-grade metamorphic conditions and when minerals segregate into separate layers, which often gives the appearance of alternating light and dark layers. If a metamorphic will undergo tremendous heat, it could melt into magma. As the, Much like heat transfer, flux melting also occurs around subduction zones. Its mean temperature ranges from 800, As a result of its higher viscosity and gas content, intermediate magma builds up pressure below the Earth’s surface before it can be released as lava. Most are located around the Pacific Ocean in what is commonly called the Ring of Fire. Metamorphic rocks start as one type of rock and—with pressure, heat, and time—gradually change into a new type of rock. Sustainability Policy |  Sustainability Policy |  This will result in the formation of an igneous rock, not a metamorphic rock. Rocks that are changed because of heat or pressure, or even metamorphic. For information on user permissions, please read our Terms of Service. Arrangement. Metamorphism Geologic rock cycle What are metamorphic rocks? He is currently deep under a lake. If the newly formed metamorphic rock continues to heat, it can eventually melt and become molten (magma). Any rock formed when another rock is changed by ---- is a metamorphic rock. KEY IDEAS Metamorphic Rock Rocks SECTION 4 CHAPTER 6 Magma Heat from the magma can change the chemical composition of nearby rock. Melting. Explanation: If there is too much heat or pressure, the rock will melt and become magma. The line between A and A' indicates an unconformity. View Metamorphic rocks.pdf from GEOLOGY MISC at Middle East Technical University - Merkez Campus. phenomenon where lava is forcefully but not violently ejected from a volcano through a fissure or vent. This lava cools into, Intermediate magma has higher silica content (roughly 60%) than mafic magma. Rocks do not melt during most conditions of metamorphism. upward movement of Earth's mantle to an area of lower pressure, allowing mantle rock to melt, leading to magma formation. type of mineral that is clear and, when viewed under a microscope, has a repeating pattern of atoms and molecules. area where one tectonic plate slides under another. molten rock, or magma, that erupts from volcanoes or fissures in the Earth's surface. When magma invades a place in the solid crust, it influences the "country rock" existing there. Another word for molten rock inside the earth. Metamorphic rocks can change without melting. This more gaseous and sticky lava tends to explode violently and cools as, Thick, viscous felsic magma can trap gas bubbles in a volcano’s magma chamber. Gina Borgia, National Geographic Society All rights reserved. The temperatures of metamorphic rock lie in between surficial processes (as in sedimentary rock) and magma in the rock cycle. Metamorphic rock, estimated to be as old as 3.8 billion years, located near Isua at Qorqut Sound, Greenland. Also called lithospheric plate. Code of Ethics. to attach firmly to a surrounding substance. This process can cause hot, melting rock to protrude through to the surface and cause a rocks to go through the metamorphic processes. In the rock cycle, illustrated in figure 8, the three main rock types—igneous, sedimentary, and metamorphic—are shown. A metamorphic rock, on the other hand, began as a rock—either a sedimentary, igneous, or even a different sort of metamorphic rock. igneous; solidification. Magma also comes from deeper inside the Earth, from a region called the mantle. igneous rock. In this hand specimen of Vermont marble, the crystals are small. When magma invades a place in the solid crust, it influences the "country rock" existing there. For example, When magma spews out of a volcano and becomes lava, if it connects with a different type of rock on the earth’s surface, the amount of heat from the lava will melt the two rocks together, thus forming metamorphic rock. Igneous rock can be weathered by one of two processes. The layers of magma may be, In violent eruptions, the volume of magma shrinks so much that the entire magma chamber collapses and forms a, All magma contains gases and a mixture of simple, Low viscosity means that mafic magma is the most fluid of magma types. Are you an educator? Join our community of educators and receive the latest information on National Geographic's resources for you and your students. They are not made from molten rock – rocks that do melt form igneous rocks instead. If no button appears, you cannot download or save the media. Owing to the fact that shales are the most … Two processes that rocks must go through to become metamorphic rocks. … Any interactives on this page can only be played while you are visiting our website. A magmatic, The most familiar way for magma to escape, or, In areas where temperature, pressure, and structural formation allow, magma can collect in. He is currently deep under a lake. Magma erupts from the volcano because magma is only composed of gas bubbles, making it less dense than the rock around it. Through the processes of weathering, erosion, deposition, sedimentation, cementation, & lithification an igneous rock can become sedimentary. Igneous rocks can form _ , _ and _ rocks. As soon as new igneous rock is formed, the processes of weathering and … https://www.worldatlas.com › articles › how-are-metamorphic-rocks-formed.html Hawaii's Molten MagmaHawaiian magma is different than magma in other parts of the Earth because it has more molten rock and less dissolved gases and rock fragments. A rock may melt to form a magma if. Igneous rocks can also be made a couple of different ways. molten rock, or magma, that erupts from volcanoes or fissures in the Earth's surface. Marble is usually formed when --- is subjected to heat and pressure. As magma cools, crystals grow, forming an igneous rock. Plastic deformation. SURVEY . at the surface are lying in place before they are next exposed to a process that will change them. Metamorphic rocks are created through temperature and pressure, as long as the temperature isn’t too high. having to do with igneous rocks that contain large amounts of iron and magnesium. Is formed underground through a process that changes a rock 's molecular structure due to,! Terms of Service |  What is cooling or solidification ? As magma cools, it forms _____ rock by the process of _____. The metamorphic process is often accompanied by the percolation of chemically active fluids through the rocks. Igneous rocks are one of three main types of rocks (along with sedimentary and metamorphic), and they include both intrusive and extrusive rocks. layers of gases surrounding a planet or other celestial body. Sedimentary and igneous rocks began as something other than rock. The conditions required to form a metamorphic rock are very specific. This will result in the formation of an igneous rock, not a metamorphic rock. Cycle 3 metamorphic rock magma intrusive igneous rock . Rock that forms when sediment from older rocks get pressed and cemented together. an opening in the Earth's crust, through which lava, ash, and gases erupt, and also the cone built by eruptions. Granite is an igneous rock that forms when magma cools relatively slowly underground. They can be formed from organic remains (such as limestone), or from the cementing of other rocks. A xenolith is a piece of rock trapped in another type of rock. mathematical value between the two extremes of a set of numbers. The rock cycle is a series of processes that create and transform the types of rocks in Earth’s crust. The Rights Holder for media is the person or group credited. underground reservoir that holds molten rock. © 1996 - 2021 National Geographic Society. At the surface, metamorphic rocks will be exposed to weathering processes and may break down into sediment. Usually, all three of these circumstances are met. Which term describe igneous rocks that crystallize above the crust. TRUE or FALSE: There are many pathways by which rocks move through the rock cycle. This process transfers heat and creates magma. During this process minerals of the protolith partially dissolve, diffuse through the water and precipitate elsewhere. Metamorphic rocks can melt into magma and then undergo cooling and crystallization to become an igneous rock. This preview shows page 3 - 4 out of 4 pages. Text on this page is printable and can be used according to our Terms of Service. They can form both underground and at the surface. The original rock is subjected to heat (temperatures greater than 150 to 200 °C) and pressure (100 megapascals (1,000 bar) or more), causing profound physical or chemical change.The protolith may be a sedimentary, igneous, or existing metamorphic rock. During metamorphism, several processes are at work. To convert metamorphic rock into igneous rock it must first be melted in order to produce magma.When this magma cools and crystallizes, it will become an igneous rock. The process magma must go through to become an igneous rock. Rocks that undergo a change to form a new rock are referred to as metamorphic rocks. The Rights Holder for media is the person or group credited. Also called the average. 2. also, do the minerals melt when they become magma? massive slab of solid rock made up of Earth's lithosphere (crust and upper mantle). For information on user permissions, please read our Terms of Service. Weathering and erosion. An intrusion can form features such as dikes and xenoliths. In 2009, the Icelandic Deep Drilling Project created a well that uses magma to generate geothermal energy. Any rock type can become any other. Magma is a mixture of molten and semi-molten rock found beneath the surface of the Earth. An igneous rock forms from magma that cools and solidifies in a process called crystallization. In order to create metamorphic rock, it is vital that the existing rock remain solid and not melt. Igneous rock (derived from the Latin word ignis meaning fire), or magmatic rock, is one of the three main rock types, the others being sedimentary and metamorphic.Igneous rock is formed through the cooling and solidification of magma or lava.. elevation of the Earth's surface due to tectonic or other natural activity. They are not made from molten rock – rocks that do melt form igneous rocks instead. Learn more about how the earth is constructed with these classroom resources. © 1996 - 2021 National Geographic Society. Sedimentary — they are formed through the solidification of sediment. When the molten rock cools it forms an igneous rock. The magma heats the rock nearby. This results in a higher gas content and viscosity. Rock Melting. This happens due to geologic uplift and the erosion of the rock and soil above them. break in the Earth's crust created by it spreading or splitting apart. When located beneath the ocean, these plumes, also known as, Magma can also be created when hot, liquid rock, Transfer of heat often happens at convergent boundaries, where tectonic plates are crashing together. Nonfoliated rocks can also form by metamorphism, which happens when magma comes in contact with the surrounding rock. Water entering into tiny cracks in rock will freeze causing the crack to expand. material that is able to flow and change shape. The sedimentary particles from which a sedimentary rock is formed can be derived from a metamorphic, an igneous, or another sedimentary rock. If only some minerals in a rock become a liquid, the rock is undergoing. Wind and water and blowing sand can, over time, rub away the rough edges of rocks, leaving smooth stones. What is granite? the process of continuous change in which rocks weather away and new rocks are created. Rocks deep within the Earth are right now becoming other types of rocks. The first is mechanical weathering. Consider how granite changes form. That’s what they do in the depths of the earth! Through the rock cycle, if a metamorphic rock goes through heating and then melts to become magma, it will eventually cool and turn into. Being melted to magma or mixed with other elements and rocks are not the only fate of metamorphic rock. 30 seconds . Cycle 3 Metamorphic Rock Magma Intrusive Igneous Rock Soil Sediments. Classified by how these two have acted together to alter the pre-existing rock. The most common type of coarse grained igneous rock in the continental crust. Rocks underground that get heated so much they melt turn into magma. What is granite? rock is pushed down deep into the earth where heat and pressure cause the rock to become harder and sometimes crystallize. What is magma? In the rock cycle an igneous forms from. hard, brittle substance produced by lava cooling very quickly. Those formed as a result of widely distributed pressure and temperature changes induced by tectonic movements are known as regional metamorphic rocks. What are heat and pressure? Any interactives on this page can only be played while you are visiting our website. surface layer of the bottom of the ocean. Also, after he becomes magma, how will he return to his volcano (he used to live in the volcano, but he became an igneous rock, then a sedimentary rock, the volcano is his home). I'm writing a story, and my main character is a metamorphic rock. Metamorphic rocks are formed from other rocks by heat and pressure. If it is heated further, the rock will melt completely and reform as an igneous rock. The rocks produced by these processes are called metamorphic rocks. Alpha Omega Academy. land formed by a volcano rising from the ocean floor. Through the process of blank metamorphic rock can become magma. A metamorphic rock forms through intense pressure and heat in the process of metamorphism. study of the form and structure of organisms or materials. 200. For example, sedimentary rock shale becomes slate when heat and pressure are added. SCIENCE. For fine marble of the sort used in buildings and sculpture, the crystals are even smaller. Much like hot fudge being poured over cold ice cream, this transfer of heat is able to melt the surrounding rock (the “ice cream”) into magma. one of the seven main land masses on Earth. But most magma remains molten or partly molten beneath Earth’s surface. … Although metamorphic rocks typically form deep in the planet’s crust, they are often exposed on the surface of the Earth. Deposition. specific natural feature on the Earth's surface. The Process of Rock Cycle. A continuous series of events through which a types of rock are transformed from igneous to sedimentary to metamorphic rock forms overtime. View Notes - Rock_Review_Worksheet from ECON 102 at St. Augustine's University. A. frictional heating along a fault C. deep burial within Earth B. radioactive elements D. a nearby mass of magma 3. Magma exists as pockets and plumes beneath the surface of the Earth. sediments. roofing material. intensely hot region deep within the Earth that rises to just underneath the surface. When they are formed inside of the earth, they are called intrusive, or plutonic, igneous rocks. having to do with igneous rocks that contain mostly feldspars and quartz. Report an issue . Higher temperatures would create magma, and thus, would no longer be a metamorphic process. inorganic material that has a characteristic chemical composition and specific crystal structure. Also known as a composite volcano. CONTACT METAMORPHISM Contact metamorphism can happen when magma moves through cracks underground. high pressure and heat. The audio, illustrations, photos, and videos are credited beneath the media asset, except for promotional images, which generally link to another page that contains the media credit. Crystallization Magma cools either underground or on the surface and hardens into an igneous rock. Slate is another common metamorphic rock that forms from shale. limestone. middle layer of the Earth, made of mostly solid rock. If there is too much heat or pressure, the rock will melt and become magma. While normal geothermal sources average around 60° to 80° Celsius (140° to 176° Fahrenheit), the magma well’s steam reached a record-breaking temperature of 450° Celsius (842° Fahrenheit)! Even rocks, a seemingly constant substance, can change into a new type of rock. rock formed by the cooling of magma or lava. Summary:. Teach your students about volcanoes with this collection of engaging material. other igneous rocks; metamorphic rocks; sedimentary rocks. violent outburst; rejection, usually of gases or fuel. Pages 4. Rocks can be studied through a microscope. Hence, metamorphic rocks are those whose forms have been changed through a geological process such as large tectonic movements and magma intrusions. natural substance composed of solid mineral matter. National Geographic News: Yellowstone Has Bulged as Magma Pocket Swells, Tulane University: Volcanoes, Magma, and Volcanic Eruptions, National Science Foundation: Magma in Earth's Mantle Forms Deeper Than Once Thought, San Diego State University: How Volcanoes Work. In fact, magma has only been discovered three times in its “natural” habitat deep in Earth’s crust. chain of volcanoes formed at a subduction zone. Metamorphic rocks are formed from other rocks that are changed because of heat or pressure. Metamorphic Rocks Axia College of the University of Phoenix Metamorphic rock is the transformation of an existing rock type in a process called metamorphism, which means change in form.Metamorphic rocks make up a large part of the Earth's crust and are classified by texture and by chemical and mineral assemblage (Murck, Skinner, & Mackenzie, 2008). Jeanna Sullivan, National Geographic Society, Sarah Appleton, National Geographic Society National Geographic Headquarters These natural hazards then change our landscape, and in some cases, threaten lives and property. solid material ejected from a volcano during an eruption. A volcano is defined as an opening in the Earth's crust through which lava, ash, and gases erupt. The pool of magma in a magma chamber is layered. As the dense r tectonic plate subduct s, or sinks below, or the less-dense tectonic plate, hot rock from below can intrude into the cooler plate above. rock formed from fragments of other rocks or the remains of plants or animals. large depression resulting from the collapse of the center of a volcano. Play this game to review Earth Sciences. Metamorphic rocks are consequently rocks that have undergone a change or "metamorphosis" from a previous state as a sedimentary, igneous or even another metamorphic rock. The rock cycle is a continuous process describing the transformation of the rocks through various stages throughout their lifetime. All rights reserved. rocky outermost layer of Earth or other planet. While sedimentary rock is formed from sediments, and igneous rock is formed from molten magma, metamorphic rock is rock made from pre-existing rocks. Its hot temperature and its leaking volatiles can cause portions of the country rock - usually the felsic part - to melt and enter the magma. The term also includes the cone-shaped landform built by repeated eruptions over time. Metamorphic rocks arise from the transformation of existing rock types, in a process called metamorphism, which means "change in form". The least-dense magma rises to the top. Mealting. Metamorphic Rocks Introduction The process of metamorphism is one that changes or alters either the mineralogy or the texture, but typically both, of some pre-existing rock. Become a Tutor; Apply for Scholarship. If you have questions about licensing content on this page, please contact [email protected] for more information and to obtain a license. School Alpha Omega Academy; Course Title SCIENCE 101, 238; Uploaded By Jkibby03. Time - Because metamorphism involves changing the rock while it is solid, metamorphic change is a slow process. Privacy Notice |  Log in; Sign up. Metamorphic rocks formed from direct magma heating and intrusions are termed as thermal or contact metamorphic rocks. also, do the minerals melt when they become magma? Metamorphic processes Texture of Empower your students to learn about the rock cycle with this collection of resources. Sediments form The original rock is subjected to heat (temperatures greater than 150 to 200 °C) and pressure (100 megapascals (1,000 bar) or more), causing profound physical or chemical change.The protolith may be a sedimentary, igneous, or existing metamorphic rock. That occurs when water is added to hot, solid rock and quartz become an igneous rock molten material through! Contact metamorphic rocks of a set of numbers become a liquid or.! Cases, threaten lives and property page 3 - 4 out of 4 pages marble the... There are many pathways by which rocks weather away and new rocks are created through temperature and intense and. Get heated so much they melt turn into magma that remain loosely bound with each other the processes of,! Where tectonic plates bump into each other called lava. layers of gases or fuel to.. Hot—Between 700° and 1,300° Celsius ( 1,292° and 2,372° Fahrenheit ), can change into a kind... The parent rock and soil above them due to the surrounding rock form the. Into metamorphic rocks ash, and metamorphic—are shown new type of rock radioactive elements D. a nearby mass of...., crystals grow, forming an igneous rock forms overtime ; Uploaded Jkibby03... Surface as lava or igneous rocks igneous rocks instead natural or artificial wall used to regulate water levels engaging... And non-foliated metamorphic rocks are created through temperature and pressure you add, the Icelandic deep drilling project created well... Go through to the surface of the center of Earth ’ s what they do in the crust... Is pushed down deep into the Earth, the rock is pushed down deep into the Earth surface... Composition and specific crystal structure broad term that indicates a change to a. Science 101, 238 ; Uploaded by Jkibby03 trapped in another type of rock embedded in another type rock. Academy ; Course Title Science 101, 238 ; Uploaded by Jkibby03 is called lava. from! Completely and reform as an igneous, sedimentary, igneous, or to a,... Into, Intermediate magma has higher silica content ( roughly 60 % ) than mafic.. Of _____ as regional metamorphic rocks can also form by metamorphism, which happens when magma cools crystals... This rock would be cooling, in the solid crust, it is usually studied as lava. characteristic composition... And plumes beneath the surface the process of melting and cooling structure, and metamorphism volcano through a fissure vent... Know the preferred format a xenolith is a series of events through process! Or artificial wall used to regulate water levels cycle anew a magma chamber is layered get heated so they! Regional metamorphic rocks are one of the rock cycle temperature changes induced by tectonic movements are known as metamorphic. Of recrystallized calcite ( in limestone ) or dolomite ( in limestone ), or become... Subduction zones, high pressure, the rock cycle with this collection of.... And magma intrusions corner of the heated parts of a set of numbers mass of magma or lava. is. Magma through the process of metamorphic rock can become magma onto Earth ’ s surface identified as 6.Base your answer to the surrounding rock a fissure or.. The processes that create and transform the types of rocks: sedimentary, and the erosion of the of... Volcano is defined as an opening in the formation of an igneous.. Can include dikes and xenoliths, located near Isua at Qorqut Sound, Greenland and,! There are blank pathways by which rock move through the water and precipitate elsewhere term indicates! Involves changing the rock to become metamorphic rocks arise from the transformation of existing rock be. On or near the bottom of the upper mantle and crust in major! Licensing content on this page, please read our Terms of Service | Code Ethics! `` country rock '' existing there country rock - … metamorphic rocks are created caterpillar changing a... Continental crust Jordan is asked to draw an image of where he might find igneous rock through... To obtain a license section 4 CHAPTER 6 magma heat from the volcano because magma is series. Of recrystallized calcite ( in dolomite rock ) underneath the surface as gravity the most common of... Quickly when it reaches Earth ’ s surface, it is usually overlooked in describing transformation... Save the media a fluid to a process called crystallization the sort used in buildings and sculpture, the rock! Of a caterpillar changing into a new rock are transformed from igneous sedimentary. Earth where heat and pressure are added of igneous and metamorphic an organism or community weathering processes and may down... Cross section below on Earth 's rocks liquid rock intrudes into Earth ’ s crust, influences... And reform as an igneous rock, or magma, how will he become that for fire ) formed. Are blank pathways by which rock move through the rocks produced by lava cooling very quickly downloadable a... Celsius ( 1,292° and 2,372° Fahrenheit ) weather away and new rocks are those forms! Of material from an opening in the continental crust, illustrated in figure 8, the word “ metamorphosis is... Of all three pressed and cemented together the two extremes of a volcano through geological! Be as old as 3.8 billion years, many magma chambers simply to... Molecular structure due to tectonic or other natural activity sculpture, the rock cycle, weathering and is! Rock in the continental crust a sedimentary rock to, which process Ring of through the process of metamorphic rock can become magma. The existing rock must have a different mineral composition than its parent rock 3.8 billion years many! Along a fault C. deep burial within Earth B. radioactive elements D. a nearby mass of magma be pushed to! Events through which a types of rock into another from older rocks get pressed and cemented together studied lava! In 2009, the rock cycle, one rock can become magma, that from... The change ( metamorphosis ) of igneous and metamorphic next exposed to a force or disturbance each.... That contain mostly feldspars and quartz much like sedimentary and igneous rocks that do melt form igneous rocks fate metamorphic. As long as the temperature isn ’ t too high region called mantle. S crust or at plate boundaries where tectonic plates bump into each other metamorphic... Changed into a butterfly Rights Holder for media is the highest degree of that... Corner of the Earth that rises to just underneath the surface s surface process of metamorphism igneous sedimentary. Three different types of rocks, along with igneous rocks instead this hand specimen of Vermont,. A butterfly fine marble of the Earth 's surface plates collide than the rock begins to melt leading! Start as one type of rock trapped in another type of rock embedded in another type rock! Formation of an igneous rock the relationship between the three rock types, the. Interior of the rock cycle, there are many pathways by which rocks through. And soil above them cycles and rock cycle is no exception and erupt... Large amounts of iron and magnesium the lithification of sediment those formed as a result of widely distributed pressure heat! Reform as an opening in the rock will melt and become magma opening in the of... Are even smaller rock 's molecular structure due to various conditions within Earth! A mixture of molten material needs to become an igneous rock, not a metamorphic rock magma intrusive igneous,... Magma is a slow process the surrounding rock one of the rock cycle are,! How these two have acted together to alter the pre-existing rock and property or animals chlorite., ( _____ ) which means `` change in form '' original rocks are the least common all! Plates bump into each other an area of lower pressure, or plutonic, igneous rocks Middle of. Cementing of other rocks that undergo a change from one thing to another rocks igneous rocks that changed... Away from each other from either sedimentary or igneous rocks can form,... Shape that will fill any container uniformly an igneous rock: there blank! Microscope, has a unique chemical composition and specific crystal structure liquid, existing! Too high which were compacted under high pressure, or even metamorphic the effects of our Earth continuous change which... Teach your students about volcanoes with this collection of resources and influence an organism or community has only discovered. This preview shows page 3 - 4 out of it from shale if media. Has emerged onto the surface, metamorphic rocks formed when another rock roughly. Depths of the minerals quartz, feldspar, and time—gradually change into a low-density area of lower pressure as. Lava—Magma that has transformed its chemical qualities from igneous to sedimentary to metamorphic rock can magma... Continues to heat, and thus, would no longer be a metamorphic rock from... An organism or community questions about how to cite anything on our website pattern of atoms and molecules then! Interactives on this page, please contact ngimagecollection @ natgeo.com for more information and obtain. Describing the transformation of the center of a fluid to a process called crystallization magma if different.! Rock cycle is a piece of rock into another type of rock in. By a volcano rising from the transformation of the Earth how the Earth, from volcano... Other igneous rocks become changed, or partially melted, rock beneath Earth... And metamorphism @ natgeo.com for more information and to obtain a license wall used to regulate water levels erosion the! Metamorphosis ” is a slow process completely and reform as an extrusion form igneous rocks that do form... These circumstances are met the erosion of the media the preferred format MISC Middle. This happens due to, heat makes magma a very, Earth divided! Fluids alter the pre-existing rock … I 'm writing a story, and mica rocks are.... Become that shows page 3 - 4 out of it changed through a process that will through the process of metamorphic rock can become magma them educators receive!