4 (a) Briefly describe the phenomenon of coring and why it occurs. (b) Cite one undesirable consequence of coring.

i think the answer is a.keratin is the pigment responsible for skin color.

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

"it built up in the atmosphere"

i think thats it, idk, i tried looking for this exact q& a for grad. and idk if i got this question right or sorry if im wrong