Item PT039001: Mountains have been developing continuously throughout earth's history.

Which of the following is TRUE about when mountains have developed on earth?

  1. All mountains on earth today were present when the earth formed.
  2. Mountains developed for a while after the earth first formed, but no new mountains are developing today.
  3. Mountains have been developing continuously since the earth formed and mountains are still developing today.
  4. Mountains have developed since the earth formed, but only occasionally.