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23 Cards in this Set
- Front
- Back
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fracture
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smashed rock, like glass
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cleavage
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smashed rock, smoothe
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flouresence
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changes colour under ultra violet light.
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crystal
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occurs in a well developed shape
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streak
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powdery mark of a rock
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hardness
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being able to scratch another mineral
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minerals
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pure, natural substance found in earths crust
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colour
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property thats sometimes used to find minerals
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geologist
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someone who studies rocks
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magnetsim
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attracts a magnet or needle
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luster
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surface of mineral that reflects light.
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rock
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earth materials made of 1 or more minerals
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name 3 rock properties
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colour, luster, flouresence
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3 main types of rocks are:
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igneous sedimentary metamorphic
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how are igneous rocks formed?
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by magma
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what is magma?
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its molten rock found underground
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what is sediment?
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large groups of soil and pebbles pressed into tight layers.
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how is sedimentary rocks formed?
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by the compression of sediments
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what are metamorphic rocks?
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they change their characteristics
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how is metamorphic rocks formed?
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extreme heat by sedimentary and igneous rocks.
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3 examples of igneous rocks
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lava rock, pumice, basalt
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3 examples of sedimentary rocks
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sandstone, limestone, shale
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3 examples of metamorphic rocks
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graphite, coal,
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