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An active volcano forms where magma reaches the earth's surface through a vent or a fissure.
Q8: Why is the green revolution unlikely to
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Q59: In recent years,jellyfish blooms have _.<br>A) been
Q67: The delta for the Colorado River was
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Q70: How is coal formed?<br>A) from hydrothermal deposits<br>B)
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Q83: Chemicals in the atmosphere combine with one