Difference between monsoon wind and polar wind

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

The physical processes that create most of earth's physical features, including mountains, are known as

What could the united states of america do to improve their status? name at least 3(ap human geography)