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Glaciers are a geomorphic agent
for the production, transfer and deposition of sediment. They derive some
sediment from the surface, for example from rockfalls or from deposition
of dust or volcanic ash from the atmosphere. They also derive sediment
from underneath the glacier, and transport it close to the glacier bed.
Yet more sediment can be transported by meltwater streams that flow through glaciers and transfer sediment out from the margin into the proglacial area. 
Sediment-laden meltwater: Iceland |
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Meltwater leaving glacier, Iceland |
