Question

which of the following is true about when mountains developed on earth?
a. all mountains on earth today were present when earth was formed.
b. mountains developed for a while after earth first formed, but no new mountains are developing today.
c. mountains have only occasionally developed since earth formed.
d. mountains have been developing continuously since earth formed, and mountains are still developing today.

Explanation:

• Option A is incorrect because mountains are formed by geological processes (e.g., tectonic plate movements) that occurred long after Earth's formation.
• Option B is wrong as new mountains are still forming today (e.g., due to ongoing tectonic activities).
• Option C is inaccurate. Mountain - building processes are not just occasional; they are part of the continuous geological evolution of the planet.
• Option D is correct. Since Earth's formation, geological processes like plate tectonics have led to continuous mountain development, and these processes (e.g., the collision of tectonic plates) are still active today.

Answer:

D. Mountains have been developing continuously since Earth formed, and mountains are still developing today.