Why does adding a second planet affect the orbit of the first planet?
a.
the sun's gravity becomes weaker as the total mass of its satellites becomes greater
b.
the sun's gravity becomes stronger as the total mass of its satellites becomes greater
c.
newton's second law
d.
the law of universal gravitation

What season is it in the southern hemisphere when it’s december? a) fall b) spring c) winter d) summer

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

The “twelve apostles” are in which national park?