Earth

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

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In weather terms, what is the opposite of heat?
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What activity allows humans to go underwater with oxygen tanks and a wetsuit?
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What is the name for a 100 foot tall tidal wave?
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Most minerals may be identified using the following methods except which?
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When a meander is cut off, what is formed?
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What submersible helped to discover the wreckage of the Titanic in 1986?
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What season has the warmest weather in the U.S.?
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What is the weather phenomenon known as a "tsunami"?
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