from what word metamorphic rock?
147582
Meta- means change, morph- means form.  \n\nSee reference here: http://en.wikipedia.org/wiki/Metamorphic_rock
627781
Limestone becomes marble in metamorphosis.\nShale becomes schist.\nSandstone becomes granite.
859170
Sure...you basically answered your own question.  But for a bit more detail:\nMost minerals have a range of temperatures and pressures at which they can occur.  The very presence of a specific mineral may  therefor constrain the temp and pressure of the rock at the time the mineral formed.  \nNot all minerals have such limited ranges, or occur in significant quantities to be of any use in the field... but those that occur in quantities that can be recognized in the field, and which have a limited p-T regime can be very useful in determining the metamorphic grade in the field.
853307
It is most likely a schist due to the foliation, mineral alignment and the lack of banding, but pyroxene is most likely to occur in a gneiss so it is probably a high metamorphic grade schist
659872
First it's igneous rock-weathering/erosion-sediment-pressure and cementation-sedimentary rock-heat and pressure-Metamorphic rock-melting magma cool to be igneous rock
92285
Slate is shale that has been metamorphized.  It is mined or in this instance quarried is a more precise term. It is layered in the ground in sheets. The overburden is first removed. The sheets are then cut into large sections and then separated by prying apart.
376538
Metamorphic rocks are formed when other kinds of rocks are changed by great heat and pressure inside the earth. The word "metamorphic" means changed. Think of metamorphic rocks as recycled rocks. When igneous, sedimentary or even metamorphic rocks get buried deep beneath the surface of the earth, over millions of years the heat and pressure inside the earth change them into something else. Limestone can be changed to marble, sandstone can be changed into quartzite, and shale can be changed to slate. It's just another example of how the earth is constantly changing!\n\n=)
886078
The length of time for schist to form is highly variable and dependent on the surrounding environment.  The first link below gives a P-T graph (pressure vs. temperature) for metamorphic rocks.  The second link gives an overview towards schist and some pictures.\n\nhttp://csmres.jmu.edu/geollab/Fichter/MetaRx/MetaKind.html\nhttp://seis.natsci.csulb.edu/bperry/metarock/SCHIST.htm
603848
Continental/Continental plate convergence.\n\nThis happens during mountain building episodes called orogenies.
316778
I assume you mean which type of rock did all rocks start out as???\n\nThat would be igneous. All started out in a molten state. IS that what you mean???\n\n:)
887609
the rock starts as magma turns into igneous then to sedimentary the metamorphic....extreamly siplified but i think u get the point\nheres what a more complex on looks like\nhttp://geologyonline.museum.state.il.us/tools/lessons/6.4/rockcycle.gif
686990
Clastic\nChemical or Biochemical
1132053
Actually there are many important and major exceptions to the examples already provided here. While it is true that many minerals form either by crystallization from a molten state, or by crystallization from solution, there are several other important methods of mineral formation. \n\nMetamorphism is the solid state change of molecular arrangement that forms many minerals without melting or dissolution. A common group of minerals often formed by metamorphism, which is the result of high (but not high enough to liquify) temperatures and/or high pressures are garnets. Other examples are  muscovite, sillimanite, biotite, kyanite, and many more.\n\nAnother example of a change in mineral composition that does not involve either dissolution or melting is the common change of anhydrite to gypsum by hydration. Anhydrite contains only CaSO4, and when H2O is chemically combined (hydrated) with anhydrite it becomes gypsum. The process can be reversed releasing the water by a change in pressure.  There are a large number of minerals that are found either in a hydrated state (chemically combined with H2O) or in a dehydrated state. Many clay minerals will change composition under pressure and heat without melting or being dissolved in water. \n\nOther minerals that are an important group are what are known as polymorphs. Polymorphs are minerals that share the same chemical composition, but have varied molecular structure. A good example of a polymorph is calcite and aragonite. Aragonite has the same chemical composition of calcite (CaCO3), but is unstable at low temperature and pressure. At a temperature of 400 degrees C, with no change in pressure, aragonite will spontaneously alter to calcite. No melting or dissolution is involved. \n\nHere's a reference for calcite/aragonite:\nhttp://www.galleries.com/minerals/carbonat/aragonit/aragonit.htm\n\nSome minerals (as in rocks) even form by biogenic processes, however the generally accepted definition of a mineral (Nickel, 1995, Canadian Mineralogist) excludes most of these from being true minerals. While these 'biominerals' may involve precipitation of the mineral from solution, the process is not straightforward precipitation as it involves a living organism. One common example is the calcite which is deposited by molluscs as part of their shells (some deposit aragonite) and many other organisms. Many bacteria play an important role in creating some biominerals. Some ore deposits of zinc sulfides are deposited by bacterial activity. See: http://www.sciencenews.org/articles/20031115/bob9.asp\nSome commercially important iron ore deposits such as banded iron formations, were deposited by the activity of cyanobacteria and contain several iron minerals. You could argue that this was simply a precipitate from a solution, but the cyanobacteria played an important role in adding the oxygen to the water that caused the iron to precipitate out. Your teeth are another example of a biogenically deposited "biomineral". Your teeth contain hydroxy apatite. Another interesting example is the biomineral equivalent of atacamite that is found in the teeth of bloodworms. This copper mineral is quite rare and the type locality for the non-biogenically formed mineral is the driest desert in the world, the Atacama of northern Chile.\nhttp://webmineral.com/data/Atacamite.shtml \nHere is the article about the bloodworm teeth:\nhttp://www.sciencenews.org/articles/20021109/note14.asp\n\nTwo other minerals that have an interesting method of formation are coesite and stishovite. These are rare dense forms of SiO2 (polymorphs of quartz) that are only found in meteorite impact craters and rarely in the kimberlite pipes where diamonds are found. These two polymorphs of quartz are formed under about 20 kilobars of pressure or more during a meteorite impact. It is hard to say if they undergo a molten state, but because they are metastable, it seems unlikely to me that they would have formed and retaine
936761
It is a sheet silicate, with one cleavage, and a hardness of one.  Found almost exclusively in metamorphic rocks.
261483
These are igneous rocks.
776966
A clastic rock is a sedimentary rock formed of particles deposited by water, wind, ice, gravity.  The particles themselves would give the rock texture--think of the gritty surface of a sandtone. Detrital texture is described by size, shape, and composition or the sorting of the redeposited particles. \n\nA chemical sedimentary rock is formed by precipitating from water solution. They precipate "in place", and are not formed by redeposited particles like clastic rocks. These include evaporites, opal, some carbonates, iron oxides, etc. Stalactites are examples. Dried up lake beds form flat layers of evaporites, another example. Chemical textures are usually crystalline with some special descriptions like pisolitic or  oolitic.\n\nThe category not mentioned is that of biological sedimentary rocks--composed largely of plant or animal material.
663187
The answer is metamorphic. It literally translates to "change form".\n\nThe statement says "pressure & heat" but does not say anything about melting. If it had said melting then it would have been igneous.\n\nIn order for a rock to become igneous it has to have melted completely.\n\nHeat & pressure cause rocks to undergo changes in crystal structure in essence causing them to realign.\n\nExample: Marble is the metamorphic form of the sedimentary rock limestone. The heat & pressure changed the crystal structure but not the chemical formula. It is still CaCO3.