![]() ![]() Metamorphic rocks are igneous or sedimentary rocks that have been transformed by great heat or pressure.Quic kT ime™ and a T IFF (Uncompress ed) decompress or are needed to s ee this pi cture. Slate, phyllite, schist, and gneiss are all metamorphic rocks with foliated texture. ![]() It is the layering and parallel alignment of flattened or directionally oriented mineral crystals. It is the result of pressure and recrystallization when rocks undergo metamorphosis. QuickTime™ and a TIFF (Uncompressed) decompressor are needed to see this picture. Marble is an example of a sedimentary or igneous rock that has been changed into a metamorphic rock. When the earth's crust moves, it causes rocks to get squeezed so hard that the heat causes the rock to change.Metamorphic rocks were originally igneous or sedimentary, but due to movement of the earth's crust, were changed Metamorphic rocks are rocks that have changed.QuickT i me™ and a T IFF (Uncompressed) decom pressor are needed to see this picture. There are 6 main kinds of sedimentary rocks.Fossils of ancient living things are preserved in sedimentary rocks.Over time the layers of sand and mud at the bottom of lakes & oceans turned into rocks.Over many years, layers of different rock bits settle at the bottom of lakes and oceans. When the water slows down enough, these sediments settle to the bottom of the lake or oceans they run into. These little bits of rock & sand are called sediments.Eventually most of the broken bits of the rock end up in the streams & rivers that flow down from the mountains.This erosion takes place because of rain, freeze/thaw cycle, wind and running water.When rocks erode, they crumble - a little bit at a time.Granite Diorite Gabbro Periodotite Pegmatite These rocks, also called volcanic rocks, form when lava cools quickly at or above the Earth’s surface. Igneous rocks that form above the Earth’s surface are called extrusive igneous rocks.They form when magma enters an underground chamber, cools very slowly, and forms rocks full of large crystals Igneous rocks that form below the Earth’s surface are called intrusive igneous rocks (or plutonic).Molten rock is called magma when it is below the Earth’s surface and lava when it is above.Igneous rocks are divided into two groups, based on where the rock forms. Igneous rocks form when molten rock cools and becomes solid.They are classified by how they were formed:.e/terc/content/investigations/es0602/es0602pa ge02.cfm.It takes thousands and million of years for rocks to change.Rocks are constantly being formed, worn down and then formed again.The Rock Cycle QuickTime™ and a TIFF (Uncompressed) decompressor are needed to see this picture. ![]()
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