Which of the following natural processes takes the longest to occur? A. plates colliding to form a mountain range B. a molecule of water moving through the water cycle C. a volcano erupting D. lightning striking a tree

a

Explanation:

It takes thousands of years for mountains to form. The water cycle only takes weeks, a volcano only takes days, and lightning striking a tree takes less than a second. Therefore, it is a as a mountain forming takes longest

A

Explanation:

It takes thousands of years for mountains to form. All the other ones happen much more often.