Question

If old mountains wear down over the course of millions of years, what is one of the primary reasons that mountains still exist?

A.
occur gradually over millions of years.
B.
occur due to human activity.
C.
do not change the Earth's surface at all.
D.
occur in one sudden movement.

Answer 1

A

Step-by-step explanation:

Not b, because it has been happening for millions of years. not c, because mountains are only above ground. and not d, because that is not usually the case.