10 Glaciation Flashcards
Epoch
Subdivision of a geological period ranging from 1-10mil years
Cold periods of temp variations were called…
Glacials
Warm periods of temp variations were called…
Interglacials
Nunatak definition
Part of the landscape protruding above ice cover
Terminal Moraine definition
Material deposited in front of the ice sheets when the ice had reached its maximum advance
Glacial ice formation:
Ice advance-ice retreat
snow accumulates
weight compresses air from underlying layers into
1.granular ice
2.firn
3.glacial ice.
Low air concentration=bluer ice
Where can valley glaciers b found
The Alps
Where can ice sheets be found
Greenland
What is glacier mass balance
Difference between the amount of ice a glacier gains in winter and loses in summer
Explaine positive mass balance
Glacier gains more ice in winter than it loses in summer = advancing
Explain negative mass balance
Glacier loses more ice and is retreating
What dors it mean when a glacier is labeled as “stationary”
When loss and gain of ice are balanced
What are the two zones glaciers have called?
Accumulation zone
Ablation zone
What is the accumulation zone of a glacier?
Snow falls and remains all year here
What is the ablation zone of a glacier?
Winter snow melts during the summer here