Moraine – The Key Points

Lateral Moraine
Forms along the edges of a glacier
Material from the valley walls is broken up by freeze-thaw weathering and plucking, which then falls on the ice surface and is transported along the sides of a glacier.
When the ice melts, the material is dropped (till), creating a ridge of material along the valley side.

Medial Moraine
Formed when two glaciers come together and the two lateral moraines are joined
When two glaciers merge, the two edges meet to form the centre line of the new glacier
When the ice melts, if forms a ridge of material along the valley centre

Terminal Moraine
Forms at the snout of a glacier
Marks the furthest extent of ice and forms along the valley floor
It resembles a large mound of unsorted debris and sediment that has been deposited due to the melting of ice

Push Moraine
Formed by glaciers that have retreated and then advanced again
The material that has already been deposited is shoved up into a pile as the ice advances forward

Recessional Moraine
Forms at the end of a glacier, where a glacier has remained stationary for enough time to produce a mound of material
Simply: small ridges left as a glacier pauses during its retreat

Ground Moraine
It is till that is spread all over the ground as a glacier retreats up a valley in warmer weather
Found where the glacier ice meets the rock underneath the glacier


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