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Rocks and minerals

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Across
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How easily one mineral is scratched by another mineral
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Synonym: lava
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A pale, fine grained volcanic rock
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Formed by sediments
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A dark, fine grained volcanic rock made of olivine and pyroxene
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Cooled magma
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Made of 1 or more minerals
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The way light interacts with the surface of an object
Down
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A speckled, coarse grained igneous rock
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A dark, fine grained volcanic rock
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Formed by high pressure
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If a rock is clear it is ______