Once the depth of snow and ice reaches more than 30 to 40 meters, the force of friction begins to pull a glacier downhill.

true or false

ANSWER: False

EXPLANATION: Glaciers move downhill due to gravity and internal deformation. Until the thickness exceeds 50 meters, it causes plastic move which causes them to start them to move. They also move through basal sliding in which it slides over terrain, lubricated by the presence of liquid water created from ice that melts under high pressure from frictional heating.