Earth

What must happen for a tree to become a fossil?

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Where does hail form?
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What is the origin of dinoflagellates?
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What submersible helped to discover the wreckage of the Titanic in 1986?
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What name was given to the west wind by the Greeks?
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Which of these islands is not considered a "hot spot", according to plate tectonic theory?
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Which one of these is most alkali?
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Which is not a source of aluminum ore?
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Which of these might help keep erosion near a stream from happening?
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