How much higher was the Rocky Mountains when they formed as compared today? What do you theorize happened to them to reduce their height?

since there are no options posted i'll give you a few examples.

a dolphin's flipper, bird's wing, cat's leg.

i think this picture will you.

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