Earth

What causes the sound in a seashell?

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What is the main cause of caves?
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Which of the following lakes has a higher salt content than normal?
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Which scale is used to describe a mineral's hardness?
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What is moving air called?
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What type of power did the ancient Persians use to grind grains?
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What is a region of Earth in which all areas share the same time called?
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What is the low pressure area along the equator called?
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Which of these rivers flows north?
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