It is not possible for global warming to have any positive side effects. t f

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

Heyi am new to are you all americans? ( just want to know , i don't mean any offence ) ?

What is the border between layers a through f and layer g called?