EQ 2.5

Question 1

Glacier movement

Answer 1

-Gravity is the fundamental reason for ice movement as a result of ice mass building up in the accumulation zone

Question 2

Faster ice movement

Answer 2

-As a result of the increasing weight, the shear stress increases as the slope angle increases which would lead to cause the ice to overcome the forces of ice strength and friction

Question 3

Temperate glaciers

Answer 3

• The base is warmer than the melting point of ice
• It’s wamer because if the friction caused by the glacier moving and geothermal heat from the earth
• The ice at the bottom of the glacier melts and at 0 degrees c the ice at the surface melts leading to the the meltwater joins the meltwater stream at the bottom of the glacier acting as a lubricant

Question 4

Polar glaciers

Answer 4

• The base is cold so there is little melting
• The ice is frozen to the base of the valley, so there’s very little movement
• There’s hardly any melting at the surface either, even in the summer. This means cold, based glaciers don’t cause much erosion at all

Question 5

Basal sliding

Answer 5

-The meltwater acts a lubricant reducing friction with both the entrained debris with the underlying bedrock (75% of glacier movement in Temperate glaciers)

Question 6

Regelation creep

Answer 6

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