Which of the following is NOTa major group of organic compounds? O nucleic acids
O salts
O lipids
O carbohydrates

answer; i believe the correct answer to the above question is ( friction)

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