Earth

What causes the sound in a seashell?

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Which rock would test positive to an acid test?
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What is the trapping of the sun's solar energy and radiation called?
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If an organic material is converted into stone, it becomes what?
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What are the traces of animals and plants left in rocks called?
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How old is the sun estimated to be?
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Which is not a source of aluminum ore?
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What device measures the speed or force of the wind?
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Al Gore made a film about what climate issue?
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