Fluvio Glacial Flashcards
Ablation
The removal of ice or snow from a glacier by melting sublimation and calving
This occurs at the about of glacier
Abrasion
The wearing and grinding of a surface through friction
This occurs when rocks become embedded in the glacier and rub against the bedrock
Milankovitch theory
Changes in the earths climate caused by variations in solar radiation received
Changes due to cyclical changes in the geometric relationship between the sun and earth
Eccentricity
The change of earths orbit from circular to elliptical
Pleistocene
Period of time from about 2 million years ago to 11,700 years ago
Mass balence
The ablation or accumulation from the glacier system
A glacier is a product of how much mass it receives and how much by melting
Dilation
The weight of the glacial ice of top of the bedrock begins to decrease releasing immense pressure causing. The bedrock to adjust and fracture
Hanging valley
A small tributary valley in high sits high above the floor of a glacial trough often has a waterfall
Terminal moraine
A ridge of moraine extending across the valley at the furthest point the glacier reached
Englacial
Melt water or material which is embedded within a glacier
What process does meltwater play a role in
Erosion entrainment transportation
And deposition
Surface melting
Contributes to lost of meltwater supply
Peaks in mid summer
Only source of meltwater for cold glaciers
Basal melting
Normally occurs in warm based glaciers
Flows under hydrostatic pressure
Can excavate subglacial tunnels by cutting through bedrock
Emerges through portals
Characteristics of fluvial glacial meltwater
High pressure
Deposited
Transport
Huge quantities of debris
Ice contact Fluvio glacial landforms
Kames
Kane terraces
Eskers
Proglacial fluvio landforms
Kettle holes
Braided streams
Out wash plain
Proglacial lakes
