You and lucy will never settle your quarrel unless each other directly and listen to what the other person has to say.

me and my friend did 2

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