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24 Cards in this Set
- Front
- Back
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Hardest material of the earth's crust
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rocks
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What group of rock makes up 75% of the earth?
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sedimentary
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Another name for rock salt.
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halite
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Used to make glass.
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sandstone
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The only stone formed by living animals.
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reef sandstone
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The rarest most beatifullest gems.
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precious stones
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A rock that contains a metal together with impurities.
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an ore
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Hardest of all known minerals.
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diamonds
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Most commonly known metals.
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iron and aluminum
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Small deposits of ingenous and metamorphic rock.
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gemstones
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A metal that is a good conductor of electricity.
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copper
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Most common type of coal.
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bituminous
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Most exspensive type of coal.
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anthractice
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Poorest type of coal.
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lignite
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Natural type of petroleum.
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crude oil
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Stalactites grow were in a cave?
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the ceiling
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Stalagmites grow were in a cave?
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the ground
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Any trace of plant or animal left in a rock.
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a fossil
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What is the ennd of the magnet called?
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a pole
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What is the magnetic field produced by the earth?
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magnetosphere
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Designed to live in or above a cave.
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troglophile
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Visits a cave regulary but goes to the surface for food.
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trogloxene
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The study of caves?
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speleology
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Formed by underground rocks that are disssolved by water?
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a solution cave
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