Earth

What is the main cause of caves?

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In what month does the vernal equinox take place in the northern hemisphere?
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What does your body use to get rid of salt?
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What are the features on the surface of the Earth called?
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Ruby and sapphire are gem forms of which mineral?
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What reef is the largest living structure on Earth?
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Which of the following is a renewable resource?
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Which of these might help keep erosion near a stream from happening?
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What is the area filled with groundwater called?
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