lecture 22

Question 1

Erosion

Answer 1

Rock fragments in the glacier act like sandpaper on the bedrock below

Question 2

Large rocks in the glacier gouge lines in the bedrock called…

Answer 2

Striations

Question 3

Roche moutonee

Answer 3

Asymmetric bedrock hills shaped be ice

Question 4

Before glaciation how are the river valleys shaped

Answer 4

Like V’s

Question 5

Before glaciation what elevation are the tributary mouths compared to the trunk stream

Answer 5

The same

Question 6

During glaciation

Answer 6

valley fills with ice, undergoes extensive erosion and becomes much steeper

Question 7

After Glaciation

Answer 7

Landscape now has U-shaped valleys, hanging valleys, cirques, aretes, horns

Question 8

Cirque

Answer 8

A bowl shaped basin eroded by a cirque glacier, after the ice melts it is filled with a tarn lake

Question 9

A horn

Answer 9

Peak formed by three or more cirques that coalesce

Question 10

Hanging valley

Answer 10

Results from the intersection of a tributary glacier with a larger valley

Question 11

Fjords

Answer 11

U- shaped glacial troughs that have become flooded by the sea

Question 12

Transport

Answer 12

Ice picks up rock fragments at the base which deepens valleys

Question 13

Depostition

Answer 13

Rock and setiment that build up at the front of the glacier = TERMINAL MORAINE

Question 14

Deposition

Answer 14

Lateral moraine = rock build up at the edges, medial moraine = rock build up in the middle

Question 15

Lakes form by melt water pooling behind moraines as glaciers retreat

Answer 15

yup

Question 16

What marks the furthest extent of glaciers

Answer 16

Moraines

Question 17

Erratic boulders, very large boulders that have traveled a long way, could have been deposited by ice

Answer 17

Deposition

Question 18

Eskers

Answer 18

Long curvy(sinuous) ridges of sand and gravel, form as meltwater channels within or below ice