Why might a juvenile scrub jay help it's parents raise a new brood of chicks instead of building its own nest?

the areas around the equator

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