Question

People travel from all over the world to see more than 30 glaciers at Glacier National Park in Alaska.

Which factor causes glacial movement downhill?

A. gravity
B. oceans
C. snow
D. wind

Answer 1

The answer is c

Glaciers move by sliding over bedrock or underlying gravel and rock debris. With the increased pressure in the glacier because of the weight, the individual ice grains slide past one another and the ice moves slowly downhill.

Answer 2

The answer I believe is c
Explanation
During the day when temperatures are higher, the snow melts and water enters the cracks in the rock. When the temperature drops below 0°C the water in the crack freezes and expands by about 9 per cent. This makes the crack larger.