Glacier deposition and Hydrology Flashcards
What are glaciers?
Glaciers are blocks of ice that flow under their own weight.
How are glaciers connected to people’s livelihoods?
Though irrigation, HEP, and glacial hazards
Transportation
– Supraglacial- Moraines
– Englacial
– Subglacial
Erosion
– Abrasion
– Plucking
– Meltwater
Erosional Landforms
– Striations
– Roche Moutonnées
– Cirques
– U-Shaped valleys
What are moraines?
Accumulations of dirt and rocks that have fallen onto the glacier surface or have been pushed along by glacier as it moves.
Lateral moraines
Forms along the edges of glacier material from valley walls are broken up by frost shattering and fall onto ice surface to be then carried along the sides of the glacier..
When ice melts it forms a ridge of material along the valley side.
Recessional moraines
Form at the end of the glacier, so they are found across the valley, not along it.
Same as terminal moraine but they occur where retreating ice pauses rather than furthest extent.
Terminal moraines
Forms at the start of the glacier- marks the furthest extent of ice, pushes lots of earth as it advances and forms across the valley floor.
Supraglacial moraine
Material at the surface of the glacier including lateral and medial moraine, loose rock debris and dust settling out from the atmosphere.
Push moraine
Formed by glaciers that have retreated and then advanced again.
Moraine formation processes
Supraglacial melt
Push moraines
Moraine formation processes
Supraglacial melt
As debris and rocks fall to the bottom of glacier, the ice is melting at lower altitude.
Moraine formation processes
Push moraines
The ice pushes everything up in this formation.
Formed by glaciers that have retreated and then advanced again.
Subglacial Landforms form…
beneath the glacier.
E.g Flutes, Drumlins
