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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.