What role do natural resources play in the economy of a country?

Which of the following countries has declared itself nuclear free

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

Combine like terms. do not forget to use the distributive property to simplify the first term. 2(3y + 5k) - 2k