How do glacial landforms develop over time as climate changes Flashcards
1
Q
Glacio-fluvial landforms
A
- formed by glacial meltwater
- include erosional and depositional landforms
- most landforms visible today were formed by deglaciation
- landforms produced in seasonal retreat are often severely modified due to periods of re-advance
2
Q
Post glacial climate change
A
- Glacial periods end when temperatures rise
- Most of the global temperature in the last 2.6 million years has been lower than todays average
- Glacial periods are followed by short interglacials separating glacial periods which usually last 10-15k years
3
Q
Jokulhaulps
A
- extreme glacial outburst floods
- move masse volumes of sediment
- caused by geothermal activity or water
4
Q
Delta kames
A
- some are formed by englacial streams emerging at the snout
- lose their energy at the base of the glacier and deposit their load
- some form from supra glacial streams depositing material as they re-enter ice marginal lakes
- lose energy as they enter the static body of water
- some form as debris filled crevasse collapse during retreat
5
Q
Kame terraces
A
- ridges of material along the edge of a valley floor
- supra glacial streams at the end of the glacier pick up and carry lateral moraine
-this water is deposited on the valley floor during retreat - streams form due to melting of ice in contact with valley sides due to friction
- deposits are more round and sorted
6
Q
Eskers
A
- a long sinuous ridge of stratified sand and gravel
- deposited by glacial meltwater
- deposited in sub-glacial tunnels as the supply of meltwater decreases at the end of the glacial period
- sub glacial streams carry large amounts of debris under pressure in confined tunnels
- the height of the Esker varys along
7
Q
Outwash plains
A
8
Q
Modification
A
9
Q
How does climate change effect geomorphic processes
A
10
Q
Regolith
A
11
Q
Patterned ground
A
12
Q
Pingos
A
13
Q
Modification
A
14
Q
A
