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Esker A ridge of sediment (often winding) made up of sand and gravel deposited by glacial meltwater.
They show that sediment was carried by meltwater derived from an ice front situated on high ground to the south.
When surface meltwater refreezes internally, it releases huge amounts of latent heat thus softening the ice column.
The Gap is a ravine carved by glacial meltwater.
The most likely potential source for such an anomaly is meltwater from the antarctic ice sheet in a global warming scenario.