16 n 17: Glaciers

Question 1

What is a glacier?

Answer 1

a large, longlasting mass of ice formed on land, that moves due to influence of gravity and its own weight.

Question 2

How does a glacier form?

Answer 2

Accumulation and compaction of snow Packs snow into firn then refreezes to ice

Question 3

What is a cirque?

Answer 3

Glaciers that erode basins into mountainsides

Question 4

Valley glacier

Answer 4

Flow into already existing stream valleys; picking up material las they go

Question 5

Ice caps

Answer 5

Masses of glacier on mountain top

Question 6

Zone of ablation

Answer 6

Loses ice

Question 7

Zone of accumulation

Answer 7

Gain of ice

Question 8

Which way to glaciers flow?

Answer 8

Towards zone of ablation; as has thin layer of meltwater at its base

Question 9

What happens to MP if at higher pressure?

Answer 9

Lower MP; ice more likely to be liquid.

Question 10

How to tell which direction glaciers moving?

Answer 10

Glacial abrasion patterns or striations on bedrock

Question 11

Roche moutonee

Answer 11

Glacial abrasion on one side; sharp an smooth. Then quarrying on one side (bedrock massed removed)

Question 12

Diff. between water made valley n glacier made

Answer 12

water= v-shaped valley
Glacier= u shaped valley (bowls)

Question 13

How great lakes formed?

Answer 13

Weight of the glacier pushed the crust and mantle down formed a lake. (mantle slowly pushing up)

Question 14

Unsorted glacial deposit

Answer 14

Unsorted, unstratified sediment deposits by melting ice (usually moraines)

Question 15

Sorted glacial deposit

Answer 15

sorted stratified sediments deposits

Question 16

Effects of Glaciation on environment

Answer 16

Change climate; increase precip.
Depress continents (cause lateral rebound)
Drop sea level
Form dams