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In this lesson we are going to discuss about the glacial deposition

Answer Text:
Glacial Deposition
- Material carried by the glacier is called moraine.
Types of Moraine
a) Ground/sub-glacier moraine
- load carried at the base of the glacier.
b) Englacial moraine - load within the glacier.
c) Lateral moraine - load carried at the sides of the glacier.
d) Medial moraine - load carried in the centre of the valley by glacier.
e) Terminal/recessional moraine - load deposited at the point where a glacier melts.


Types of Glacial
Deposits/Drift:
a) Till - directly deposited by ice on melting in unstratified manner.
b) Fluvial - materials deposited by water from the melting ice in stratified manner.

Causes of Glacial Deposition
a) Amount of glacial drift
When ground moraine is too much the glacier glides over it leaving it behind.
b) Weight of glacier
When more ice is added to a stationary glacier pressure is exerted at the base causing melting and the material
which was embedded in the ice is dropped.
c) Climatic change
During summer and spring ice melts depositing some materials the glacier was carrying.
d) Friction beneath the ice
Friction between ice and surface reduces ice speed causing heavy materials to be deposited beneath ice sheets.
e) Slope
Lowlands allow glacier to accumulate a lot of materials which are finally deposited by melting ice.