Metamorphic changes occur while the rock is in a solid or...?
102201
Plastic state.  \n:-) Hope this helps!
312225
The process as a whole is known as 'continental drift,' or 'plate tectonics'. This process is further divided into several processes: divergence, or where plates are moving away from one another as a result of lava welling up and cooling in a mid-ocean ridge; convergence, where two plates collide and either form mountains or subduct depending on their types; and transformance, where tow plates move at opposite directions parallel to one another. \n\nKnowing this, your question can be answered. You are describing convergance between either two oceanic plates or one oceanic plate + one continental plate. The process is also known as subduction, and can form large mountains and volcanic/seismic activity.
857565
Any class of rocks that are the result of partial or complete recrystallisation of pre-existing rocks such as sedimentary or igneous rocks... or other metamorphic rocks!\n\nfor low grade metamorphic rocks the prefix meta- is commonly used i.e. meta-basalt or meta-sandstone.\n\nNaming of metamorphic rocks is also reliant on the dominant minerals occuring in the rock i.e. Biotite Schist\n\nhere are some names of some common metamorphoc rocks\n\nHornfels\nSchist\nGneiss\nEclogite\nAmphibolite\nMylonite\nSerpentinite\nMarble\nGranulite\nAnorthosite\n\nhope this helps
58331
Igneous rocks are formed with heat. They are most commonly found around volcanoes. Metamorphic rocks are formed with heat and pressure. Sedimentary rocks, like sandstone and limestone, are formed by pressure.
762090
With ribbons in the structure (where the pressure changed the rock) just like gneiss\nWith sheets in the structure (also caused by pressure) just like schiste\nWithout ribbons or sheets (where heat changed the rock) just like marble
393590
Well, sedimentary has "sediment" in it. You know, the yucky mud stuff on the bottom of a river or stream. That's what sedimentary rocks are made of.\n\nIgneous looks like ignite, which is to start a fire. Volcanoes have red-hot magma in them, and that's what igneous rocks are formed from.\n\nA metamorphosis is a change from being one thing to being something else (like a caterpillar becoming a butterfly.) Metamorphic rocks are formed when other rocks are transformed by heat and pressure deep withing the earth's crust. \n\nI know you probably wanted some kind of clever mnemonic device, but in this case all you have to do is remember the meanings of three common words.
554793
Cleavage\nUsually occur in smaller scale,\nReflect internal structure of rocks and crystals\nUsually more regular nature in shape and spacing\nRelatively flat and smooth discontinuity surface\n\nFracture\nUsually occur in larger scale\nReflect external stress field of rocks more\nUsually more irregular nature\nRough and jagged discontinuity surface, sometimes accompany tiny pieces of the brocken material.
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First of all any rock can undergo ductile formation under the right conditions...\n\n1.) Heat & pressure - if enough heat & pressure are applied as in conditions deep w/in the earth then ductile deformation can occur.\n\n2.) Time - if a rock has pressure applied over long periods of time then ductile deformation can occur. If done over short periods of time a rock may undergo brittle deformation no matter what type of rock it is.\n\nThe question you are asking I believe has to do w/ composition...\n\n3.) Composition - rocks w/ strong internal bonds are more likely to undergo brittle deformation whereas rocks w/ weak bonds will more than likely undergo ductile deformation. Rocks in the former category include igneous such as basalt & granite. Rocks in the latter category would include sedimentary & some types of metamorphic rocks.\n\nRocks such as quartz & feldspars tend to be very brittle whereas ones containing calcite & micas are more ductile.\n\nBased on this, the answer to your question would be dolomite just as the first person said.\n\nWhy? Rhyolite is composed of quartz & feldspar; Chert is made of cryptocrystalline quartz; Quartzite is made up of quartz (SiO2).\n\nDolomite is calcium magnesium carbonate or quite simply put, a carbonate rock. It will be more likely to deform than the other 3.
439545
No, they can occur just about anywhere. They are most common in the seismically active areas, like tectonic lines, but they can also happen from other reason, like in the mountains if a piece of the rock would crumble and fall down, or if a meteor falls on earth, or if there is an underground cave or a river and it collapses... there are many reasons.
210093
Deep within the Earth it is so hot that some rocks slowly melt and become a thick flowing substance called magma. Because it is lighter than the solid rock around it, magma rises and collects in magma chambers. Eventually some of the magma pushes through vents and fissures in the Earth's surface. A volcanic eruption occurs! Magma that has erupted is called lava. \n\nalso\n\nWhen rock inside the Earth becomes hot enough it melts.\nThis molten rock, or magma, is less dense than the surrounding\nsolid rock.  Just as an object that is less dense than\nwater will float on water, the relatively low density of\nthe magma causes it to rise to the surface of the Earth.\n \nIf the magma contains water and dissolved gasses, when\nthe magma reaches the surface the water and dissolved\ngasses will suddenly expand into steam and gas, causing\na violent eruption.  This is like shaking a coke\ncan and then popping the tab.
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Metamorphic rocks are already existing rocks that change under heat, pressure or in chemical reactions (usually underground). Examples are Gneiss (that froms from Granite), Slate (formed from Shale), and Quartzite (formed from Sandstone).\n\nSedimentary rocks are rocks made from sediment (haha makes sense, no?) which can be both organic (fossils!) or inorganic. They are formed into a solid rock through a variety of different forces, including erosion, deposition, compaction, and cementation. There are 3 major groups of sedimentary rocks, which are clastic (formed from the compression of rock fragments), organic rocks (Key word: ORGANIC, aka the remains of plants and animals), and chemical rocks (formed when a solution dissolves, & minerals are left behind). Examples:\nClastic: Shale, Sandstone, Conglomerate, and Breecia\nOrganic: Coal, Limestone\nChemical: Halite, Gypsum\n\nIgneous rocks are formed from magma or lava. They are classifed according to where they were formed-- extrusive rocks are formed from lava on Earth's surface, while intrusive rocks are formed from hardened magma beneath Earth's surface. Texture and mineral composition are also factors of classification. Examples include granite (which is extremely abundant), Rhyolite, Pegmatite, Porphyry, Basalt, Pumice, and Obsidian.
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At Divergent Margins, plates move apart and new crust and lithosphere are created. This usually occurs at a Mid-Ocean Ridge, but divergent margins can also occur on land. The Great Rift Valley of Africa is a example of a divergent margin that is splitting the African Continent into two parts. Eventually, as the rift continues to open, a new ocean basin will be formed. \nWhere Oceanic Plates move apart, Magma wells up from the Mantle and crystallizes against the trailing edges of the plates. This is how new Oceanic Lithosphere is formed. Spreading across Mid-Ocean Ridges is symmetrical, and Normal Faulting predominates. Earthquakes are weak but common. As this new, hot Lithosphere cools and moves away  from the Mid-Ocean Ridge it Isostatically adjusts and settles lower into the Mantle, increasing the depth of the sea floor. This change produces characteristic Mid-Ocean Ridge Stratigraphy. \n\nSea floor Volcanism and Hydrothermal Activity are common along Mid-Ocean Ridges. \n\nMagma cooling at Mid-Ocean Ridges continuously records variations in the polarity of the Earth's magnetic field.
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Limestone becomes marble in metamorphosis.\nShale becomes schist.\nSandstone becomes granite.
305725
Yes, the seismic activity that causes one can also cause the other.  When the Earth's techtonic plates shift but experience some resistance, they shake, jump, rattle the area around that resistance.  Sometimes a crack in the Earth's crust is created or widened which creates the eventual environment for a volcano.  Othertimes volcanoes are created over a hot spot (thin crust) in the Earth's crust, like the Hawaiian islands.  This is somewhat different, although some tremors can be felt.
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Bowen's reaction series is what you're looking for.\n\nIn a nutshell, the rate of cooling, temperature, and magma composition determine which minerals form and the ultimate rock type.  The links provide more information.
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If you are asking how rocks are formed, there are three main processes: 1) Igneous rocks are formed by the solidification molten magma from deep in the earth; 2) Sedimentary rocks are formed by pressure acting on sand or other small fragments under a body of water or under other rock layers; 3) Metamorphic rocks start as another type, but are changed into a different, often more complex structure or crystalline matrix by the action of pressure, heat, friction, and/or water.
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It becomes rock on the surface of the ocean floor. It is eventually carried further & further away.\n\nSome older rock created by this process has already been "recycled" in the rock cycle; it became molten when it was subducted under continental plates.\n\nAn interesting fact is that as new rock is being created at the Mid Atlantic Ridge, the earth's magnetic field is being recorded right into the rocks. Any time there is a change in the direction of the earth's magnetic field it has been recorded.\n\n:)