Which of the following is true about ice sheets? a. They are the smallest type of glacier.

b. They flow in all directions.

c. They usually flow down valleys.

d. They are found only in high mountain areas.

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

How can minerals crystallize from materials dissolved in water? check all that apply.

Which barrier to economic development is shown in the following examples?