(it’s actually plant systems)

how many years will it be before much of the world's topsoil is depleted to the point where agriculture will be unsustainable?

A: 25 years
B: 125 years
C: 60 years
D: 500 years

fkk you n*gga

im not intirely sure but i think the anwser is d relative humidity

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