Find the mean, median and mood 5,10,12,4,6,11,13,5

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

Which city area has the most accessible oil reserves a) caspian sea b) siberia c)arctic coast d)lake baikal

Pollution from one country can affect another. for example, south korea is especially affected by pollution and dust storms that come from