Answer :
Mountains still exist today because of the movement of tectonic plates.
Explanation:
- Mountains are formed because tectonic plates smash into each other. Tectonic plates are present under the earth's crust.
- Different kinds of stresses causes these plates to move and as a result, different kinds of mountains are formed.
- Over the course of time, old mountains wear down. But new mountains continue to form because tectonic plates continue to move under the earth's crust.
- These plates have been moving since the formation of the earth. This is due to geological activities that take place on the Earth's crust.