Polar and non polar molecules.

The second one

Explanation:

Polar molecules have an even charge, like water, while non-polar molecules have uneven charge, like oil

all these collisions do one thing, and that thing is explained in the last option. when dusst, rocks and ice collide, they harden and form giant layers of rocks or hard ice.

d)   to harden materials to form different parts of earth’s layers

hope it ,

bioteacher101