ROCKS
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Transcript of ROCKS
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ROCKSROCKS
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Definition:Definition:
A rock is a mixture of minerals
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Igneous RocksIgneous Rocks
Igneous rocks are formed as lava or magma cools.
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a) Intrusivea) Intrusive If the magma cools
slowly beneath the surface, INTRUSIVE rocks result
INtrusive rocks form INside the Earth and have large crystals since there is time for them to form.
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b) Extrusiveb) Extrusive If the lava cools
quickly on the surface EXTRUSIVE rocks result.
EXtrusive rocks have EXited the Earth and have small crystals since they formed so fast.
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Other igneous rocks….
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Sedimentary RockSedimentary Rock
Sedimentary Rock is made of sediment that has been compacted and/or cemented together.
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Sedimentary Facts:75% of the Earth’s surface rock
is sedimentary.Sedimentary rocks store
ground water, oil, and coal.
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Clastic Sedimentary rock is made of fragments of other rocks.
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Organic sedimentary rock has traces of once living things in the rock.
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Chemical sedimentary rocks are formed when minerals crystallize as a solution dissolves
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Sedimentary rock is held together by COMPACTION and/or CEMENTATION:
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During compaction, rocks are squeezed together because of a lot of pressure from above.
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During cementation, rocks are held together by a mineral ‘glue’. Minerals fill in the spaces between the sediments and bind them together forming a solid rock.
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Metamorphic RockMetamorphic Rock
Metamorphic rock is rock that has been changed due to heat and/or pressure.
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Foliated metamorphic rock has bands of colors through it
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Non-foliated metamorphic rock does not have bands of color.
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Rock Cycle – Rock Cycle – any rock can become another rockany rock can become another rock