glaciation

Question 1

what are the 2 types of erosion?

Answer 1

abrasion and plucking

Question 2

what is abrasion?

Answer 2

as the glacier moves downhill, rocks that have been frozen into the base and sides of the glacier scrape the rock beneath

Question 3

what are striations?

Answer 3

the rocks scrape the bedrock like sandpaper and leave scratches behind

Question 4

what is plucking?

Answer 4

rocks become frozen into the bottom and the sides of the glacier
as the glacier moves downhill, it plucks the rocks frozen into the glacier from the ground

Question 5

what is a corrie?

Answer 5

an armchair shaped hollow found on the side of a mountain

Question 6

what is an arete?

Answer 6

a narrow ridge of land created when 2 corries erode eachother back to back

Question 7

what is a pyramidal peak?

Answer 7

if three or more corries erode back towards eachother- at the top of a mountain, a pyramidal peak is left behind

Question 8

what are interlocking spurs?

Answer 8

Hill that a river meanders around in a V-shaped valley. When viewed from downstream, these spurs appear to be locked together.

Question 9

what are truncated spurs?

Answer 9

A rounded area of land at the edge of a U-shaped valley.

Question 10

how are truncated spurs formed?

Answer 10

interlocking spurs are eroded at the ends by the glacier

Question 11

what is a glacial trough?

Answer 11

A deep U-shaped valley formed by a glacier.

Question 12

when is a glacial trough formed?

Answer 12

after the glacier has melted

Question 13

what is a ribbon lake?

Answer 13

A long narrow lake found in a glacial trough.

Question 14

what is a hanging valley?

Answer 14

A smaller valley which is located high above the main U-shaped valley.

Question 15

when are hanging valleys formed?

Answer 15

when old tributaries are left suspended

Question 16

what is bulldozing?

Answer 16

when rocks and debris, found in front of the glacier, are pushed downhill by the sheer force of the moving ice.

Question 17

what is rotational slip?

Answer 17

the circular movement of the ice in the corrie.

Question 18

what is lateral moraine?

Answer 18

material deposited along both sides of the glacier.

Question 19

what is lateral moraine made up of?

Answer 19

usually made up of weathered material that has fallen from the valley sides above the glacier.

Question 20

what is medial moraine?

Answer 20

material deposited in the middle of the glacier.

Question 21

what is medial moraine caused by?

Answer 21

This is caused by the lateral moraines of two glaciers when they meet.

Question 22

what is terminal moraine?

Answer 22

moraine deposited on the end of the glacier

Question 23

what is glacial till/ boulder clay?

Answer 23

all material deposited by a glacier

Question 24

what are erratics?

Answer 24

rocks that have been deposited from the glacier

Question 25

what are drumlins?

Answer 25

egg- shaped mounds of deposited moraine

Question 26

what is glacial drift/ glacial till?

Answer 26

all of the material moved by the glacial melt water

Question 27

what is glacial outwash?

Answer 27

the sand and gravel deposited by the running meltwater leaving the glacier

Question 28

where are the heavier particles of sand and gravel deposited?

Answer 28

in the glaciated valley

Question 29

where are the lighter, finer material such as clay deposited?

Answer 29

further away from the glacier and are deposited in the outwash plain