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Keywords rocks

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Term
Definition
Igneous rocks   Rocks formed by volcanic activity  
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Sedimentary rocks   Rocks made from sediments underwater that are cemented and compressed together  
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Metamorphic rocks   Sedimentary or igneous rocks that are changed into metamorphic because of great heat and pressure  
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Intrusive rocks   Rocks that are made inside of the earths crust  
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Extrusive rocks   Rocks that were made outside of the earths surface  
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Fossils   The remains of ancient creatures  
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Shaft mining   The process of extracting coal from the earths crust  
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Limestone   A grey sedimentary rock often found with sea creature remains  
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Sandstone   A red/cream/brown sedimentary rock formed with worn away sand  
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Marble   A white/green/black smooth metamorphic rock (was originally limestone before)  
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Quartz   A white/grey grainy metamorphic rock (was originally sandstone)  
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