Free points if you mark me as brainliest I will keep giving free points to you

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

Suppose you had to resolve the problems believed to be caused by distance decay in russia. what would you suggest?

What is the radius of a circle whose equation is (x + 5)^2 + (y – 3)^2 = 42? 1. 2 units 2. 4 units 3 .8 units 4. 16 units