Sun is a major source of energy. Why is the energy from the sun important for life on earth.

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

Why is the indus river so important to the people of pakistan?

Read the article titled "castro resigns." why did the us impose trade sanctions against cuba in 1962?