Earth

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

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What does the term "geocentric" mean?
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Which mineral is not likely to be a replacement mineral in fossils?
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What is a sudden and heavy rainfall or downpour called?
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What type of landscaping is used to help conserve moisture?
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Which mapping projection distorts the most at the Earth poles?
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From where does 90% of the water vapor in the air come?
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How many times does lightning strike the Earth every second?
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What is a sudden collapse and downward motion of ice and rocks down a mountainside?
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