gravity
Mountains are icy because the altitude makes the air cold, which makes the tops freeze.
Wind and water erosion makes the mountains smooth.
they are different in the way that they are formed.
The way that the mountains are shapped and the types of rocks.
Erosion wears mountains down, making them smaller and rounder.
What? This question makes no sense. There plenty of mountains in America. South and North America.
it makes them smaller.
Time
The mountains themselves aren't green; they only appear that way because of tree foliage.
Givemecookies is a good one!
cats\
Mountains and plateaus