rocks. definition: a rock is a mixture of minerals
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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.
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.
Sedimentary RockSedimentary Rock
Sedimentary Rock is made of sediment that has been compacted and/or cemented together.
Sedimentary Facts:75% of the Earth’s surface rock
is sedimentary.Sedimentary rocks store
ground water, oil, and coal.
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.
Metamorphic RockMetamorphic Rock
Metamorphic rock is rock that has been changed due to heat and/or pressure.