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10 Cards in this Set
- Front
- Back
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The rarest, most durable & beautiful gems are considered _____.
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precious stones
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The most commonly used metal is ______.
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iron
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What is the hardest of all known minerals?
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diamonds
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What is an ore?
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any rock containing a metal together with impurities
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Name 2 igneous rocks.
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pumice, obsidian
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Marble and slate are examples of ________.
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metamorphic rocks
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Name two sedimentary rocks.
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limestone, conglomerate
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What is any trace of a plant or animal left in a rock called?
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a fossil
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Name a metal that is a good conductor of electricity.
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copper
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Small deposits of igneous and metamorphic crystals are ___.
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gemstones
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