Glaciers - Ice Movement

Glaciers have existed on Earth for millennia, appearing stationary but actually moving downhill. This movement is due to the pressure at their base, causing some ice to melt and form meltwater, which acts as a lubricant. This reduces friction, allowing glaciers to move more easily. Many glaciers are now moving faster than ever, up to 50 meters a day, constantly changing and evolving.

What is the initial impression of glaciers when observed?

• They are growing in size.

• They appear to be moving rapidly.

• They seem to be stationary.

• They are melting quickly.

What causes the ice at the bottom of glaciers to melt?

• Volcanic activity beneath the glacier.

• Warm ocean currents.

• The immense pressure from the glacier's weight.

• Sunlight directly hitting the ice.

How does meltwater assist in the movement of glaciers?

• By freezing and expanding.

• By increasing the glacier's weight.

• By acting as a lubricant and reducing friction.

• By evaporating and causing the glacier to rise.

What is the role of a lubricant in the context of glaciers?

• To melt the glacier faster.

• To increase the glacier's speed.

• To reduce friction between the glacier and the rock below.

• To freeze the meltwater.

How fast can some glaciers move today?

• 10 meters a day.

• 20 meters a day.

• 50 meters a day.

• 100 meters a day.