What is a polygon that connects with the bases of a polyhedron

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

Hurricanes a. usually form over land b. usually intensify over land c. gain strength from ocean heat d. usually form over the poles

Is a state government creates a new tax to fund schools a example of checks and balances