At midlatitudes in spring, a phytoplankton bloom is often preceded by . Multiple Choice vertical mixing exceeding the critical depth vertical mixing becoming shallower than the critical depth the critical depth being equal to the compensation depth the critical depth becoming shallower than the thermocline

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

ever get the answers? im stuck on this as well