There are universities on all of the Pacific Islands. T OR F

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 ozone hole is at its biggest each year in the ? hemisphere in the ? season.

In which horizon of soil profile is prevent material usually found