Answer:
Ice weathering
Step-by-step explanation:
The Old Man of the Mountain was a rock formation on the side of Cannon Mountain in New Hampshire. Scientists believe it formed 200 million years ago when the mountain was covered in glaciers. New Hampshire is known for its harsh, snowy winters. In the 1920s, scientists started noticing large cracks in the face of the mountain. In 2003, the rock formation collapsed.
It would rain and then, maybe on a cold night or winter the water in the cracks would freeze and slowly expand.