The flow of a glacier begins
A)after it has reached a critical mass.
B)as pressure is exerted from behind.
C)when the accumulating snow begins to melt.
D)in the spring.

Question

Quizplus · Accepted Answer

The flow of a glacier begins after it has reached a critical mass. Once a certain amount of snow has accumulated, it begins to compress under its own weight, and the ice grains within the glacier begin to slide over each other, causing the ice to flow downhill.

The Flow of a Glacier Begins