Earth
What is the estimate of the true age of a mineral or rock called?
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What is the repeating cycle of precipitation, condensation and evaporation called?
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What type of rock forms from melted rock and comes to the surface to harden?
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What happens to the air pressure as we increase our altitude?
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Which is the common name for the top layer of the zone of saturation?
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What type of energy sources can't be replaced readily within a 30-year span?
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Which of these bodies of water would it be easiest to float and swim in?
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