Christmas Lake Esker

CHURCHILL, Manitoba (30 July 1994) -- An esker is a ribbon-shaped, snakelike pile of rock, gravel, and sand that had been at the bed of a river that ran through glacial ice. As the glacier melted, the rocks that had been at the bottom of the stream were dropped onto the land surface below, forming a mound that mirrored the shape of the stream channel. The well-drained soil that afterward formed on the esker gave trees like white spruce (Picea glauca) a foothold from which to colonize a remote part of the tundra.

Christmas Lake Esker

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