What evidence supports the idea that water once flowed on the surface of mars?
a. canyons and...
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When air at the surface diverges, airflow above must diverge, regardless of hemisphere converge in the northern hemisphere but diverge in the southern diverge in the southern hemisphere but converge in the northern converge, regardless of hemisphere?
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What causes the cyclical changes in the appearance of the moon?
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Agricultural practices in the united states nearly led to the extinction of the peregrine falcon during the 1950s and 60s.
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