glacial processes involved in the formation of glaciers

Question 1

what are the four main glacial processes

Answer 1

nivation, transportation, depostion, erosion

Question 2

what are the two types of erosion

Answer 2

plucking (meltwater frozen to the rock will pluck it a the glacier advances) and abrasion(angular material embedded in the rock scores/ smoothes the valley surface)

Question 3

what are four factors influencing rates of erosion

Answer 3

• debris size and shape
• relative hardness of bedrock
• basal water pressure
• sliding of basal ice

Question 4

what is the main product of nivation

Answer 4

hillside hollows

Question 5

what is nivation a collective term for

Answer 5

freeze thaw, solifluction, transport of running water and chemical weathering

Question 6

what is transportation

Answer 6

moving ice is capable of carrying huge amounts of debris

Question 7

what are the three ways debris can be carried by ice

Answer 7

• supra glacial - on top of the ice
• en glacial - within the ice
• sub glacial - at the base of the ice

Question 8

what is deposition

Answer 8

glaciers will deposited their load when they do not have the energy to carry it

Question 9

what are the two types of till

Answer 9

ablation till (material deposited by melting ice)
lodgement till (deposited by an advancing glacier)

Question 10

what are three distinctive characteristics of glacial till

Answer 10

angular or sub angular in shape, unstratified, unsorted