Angela found an animal while walking in the forest. Looking closely, she saw it had jointed legs, and its body was divided into segments. Its hard exoskeleton protected it from other animals.

i am positive it is c. condensing but i may be wrong

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