Glaciers

Question 1

what is plucking?

Answer 1

Chunks of rock become weaker because of freeze-thaw weathering. It then sticks to the rock and gets carried away

Question 2

What is freeze thaw weathering?

Answer 2

when water seeps into the cracks in the rock, freezes and expands, causing the rock to weaken.

Question 3

describe the formation of a corrie?

Answer 3

Snow accumulates in a hollow on the side of a mountain. Every winter, more snow collect in the hollow, and the new snow compresses the old snow, causing air to be squeezed out and ice to form. Back wall of the corrie steepens due to freeze-thaw weathering weakening the rock (by seeping into the cracks, freezing, expanding and making the cracks bigger) and plucking. Meanwhile, abrasion grinds against the base of the corrie, deepening it. As the glacier gets heavier, it moves down hill and out of the hollow in a motion called rotational slip. The rate of erosion is less at the front of the glacier, causing a corrie lip to form. As ice is lost in the zone of ablation, a moraine builds at the snout of the glacier.

Question 4

what is abrasion?

Answer 4

as the glacier moves downhill, rocks that have been frozen into the base and sides of the glacier scrape the rock beneath. The rocks scrape the bedrock like sandpaper, leaving scratches called striations behind.

Question 5

what are aretes and when do aretes form?

Answer 5

aretes are sharp-edged ridges when two or more corries erode back towards each other.

Question 6

what are pyramidal peaks?

Answer 6

when three or more corries on a mountain erode back to each other, a triangular and pointed peak is left behind at the top of the mountain.

Question 7

how do drumlins form and what shape do they have?

Answer 7

drumlins have a pear-shape to become more aerodynamic and streamlined shape.

Question 8

Example of an upland area in the UK that is affected by glaciation?

Answer 8

Cairngorms

Question 9

when do glaciers deposit?

Answer 9

When glaciers lose energy they deposit till. Glaciers also deposit till at the snout where it is melting, (terminal moraine). Meltwater streams flow out of the glacier transporting rock and clay. This collects down-valley and creates large beach-like features called outwash plains

Question 10

how do ribbon lakes form?

Answer 10

Ribbon lakes form where the bedrock of the valley was weaker and so the glacier eroded deeper

Question 11

what is terminal morraine?

Answer 11

ridges of till that mark the furthest point of advance

Question 12

recessional moraine?

Answer 12

ridges of till that mark a pint in time when the glacier was stationary

Question 13

medial moraine?

Answer 13

line of till that forms when two glaciers join

Question 14

lateral moraine?

Answer 14

ridges of till that are deposited along the sides of the glacier.

Question 15

strategies used to manage impacts of tourism in glaciated upland area in the UK?

Answer 15

Economic -
Social -
Lake district national authority imposes a 10 mile per hour limit on lake Windemere to decrease the amount of wash

Question 16

Drumlins?

Answer 16

Drumlins form when glaciers lose energy and so deposit subglacial moraine. Drumlins have a steep stoss side and gentle facing leeside. Thy can be 100meters in height and 600 meters in length. They are shaped by the glacier moving over the drumlin compressing it as it moves.

Drumlins form in clusters, basket of egg topography’