- Geology -
One of these struck Boston in 1755, Missouri in 1811 & Charleston in 1886, so it's not west coast-specific
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Of the 3 main classes of rock, this one accounts for about 75% of all the exposed rocks on land
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From the Greek kryos, "ice", it's the shape a mineral grows into when unrestricted
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Term for a plate pulling apart; a great valley in Africa has been formed by & named for it
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1 of the 3 minerals on the Mohs scale that can be scratched with a copper penny
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