Glaciation unit 4a

Question 1

What is supraglacial debris?

Answer 1

Debris which is transported on the surface of a glacier. It is where frost-shattered, avalanche and other debris falls onto the glacier from the valley side . This material is angular and unsorted.

Question 2

What is subglacial debris?

Answer 2

This debris is transported at the base of a glacier. It occurs at the glacial base. Small debris can be entrained by basal ice freezing, while larger boulders can be entrained by deformational flow and transported by traction. Some material can be plucked where regelation takes place around irregular bedrock.

Question 3

What is englacial debris?

Answer 3

Debris which is transported within the glacier. This occurs as the ice moves at variable speeds forming crevasses where debris can fall into the cracks or be carried by meltwater and trapped within the glacier.

Question 4

What is proglacial debris?

Answer 4

Debris which is transported away from the front of the glacier.

Question 5

What does entrained mean?

Answer 5

Picked up rock debris?

Question 6

What does glacial transportation mean?

Answer 6

Debris transported by a flowing ice body.

Question 7

What does fluvial transportation?

Answer 7

Debris is transported by flowing meltwater.