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Please give me correct answers

What season is it in the southern hemisphere when it’s december? a) fall b) spring c) winter d) summer

The difference(s) between the grand canyon and valles marineris is/are: (a) the grand canyon was formed by water, but valles marineris was not. (a) valles marineris is much longer than the grand canyon. (c) valles marineris is much wider than the grand canyon. (d) valles marineris has large volcanoes near it. all of the above

What is the mostly tropical region in asia