"Then he descended the esker"
Public DomainEsker - Credit: Pearson Scott Foresman

An esker is a long winding ridge of stratified sand and gravel. Eskers are found in glaciated and formerly glaciated regions of Europe and North America. Often several kilometres long, they resemble railroad embarkments in appearance.



Esker in Alaska
Creative Commons AttributionEsker in Alaska - Credit: James Brooks