Please i have no idea what it is

Which descriptions refer to fog? check all that apply. burns off when it gets dark forms at or near the ground extends up to 10 miles into the sky found in areas near bodies of water forms when the ground warms at night after a cool, dry day

:calculate the sum of the interior angles of a 13-sided polygon.

What is an additional type of erosion found at the coast? what does it mean?