Rock Classification
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Rocks that have solidified from a molten state. There are two types of Igneous rocks: Plutonic - Rock from magma rising up from deep under the earth's crust, and solidifies as it cools before it reaches the earth's surface. Volcanic - Rock that was originally lava, hot magma that reached the surface of the earth before it hardened. |
examples of: plutonic igneous rocks - Granite, Peridotite volcanic igneous rocks - Obsidian, Basalt, Rhyolite |
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Rock formed by the accumulation of particles on or near the earth's surface, and compacted down, often under extreme pressure, creating rock layers. |
examples of sedimentary rock: Limestone, Shale, Sandstone, Dolomite, Gypsum, Quartzite, and stones containing fossils |
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rocks resulting from changes within preexisting rocks, by extreme pressure, temperature, and chemical activity. |
examples of metamorphic rock: Kyanite, Mica, Garnet, Calcite, Quartz, Pyrite, Marble, Gneiss, Schist |