Lecture 18 Flashcards

1
Q

How do we measure Glacier flow

A

Surface velocity is measure with stakes, GPS, repeat aerial photography or satellite imagery
Velocity in the ice is measured from tilting of a borehole with time

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

How do crevasses form

A

Forms when ice breaks apart as it moves

Form in the upper, rigid, part of the glacier where ice speeds up, such as down steep slopes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

How fast does a glacier move?

A

Glacier flows fastest at the center and near the top

Glacier flows slowest along the slides and near the base

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Can water ever flow uphill

A

Yes under pressure

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

How does water get to the bottom of the glacier for basal sliding?

A
  • Pressure melting of ice at the base

- Transfer of water from surface melt to base

How well did you know this?
1
Not at all
2
3
4
5
Perfectly