How do you explain similar glacial scratches on rocks in australia and antarctica

The 5th term in a series of even number that begin 3x

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

People make choices about how to use resources.