Earth

Which scale is used to describe a mineral's hardness?

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What type of rock is coal?
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Which of the following is a renewable resource?
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What is the very sticky form of clay till called?
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Which of these is a way to curb human pollution?
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What is the name of the fossil resin that is often used in jewelry making?
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Rapidly descending air beneath a thunderstorm is what?
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What kind of scientist studies weather and climate?
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The Earth's atmosphere lies just above what part of its composition?
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