From a tunnel in the retreating glacier comes a long, sinuous ridge of stratified gravel laid by the water of an under-ice stream. This feature is called a(n) . esker terminal moraine kettle outwash plain drumlin

 An Esker

Explanation:

An esker( derived from the irish word , eiscir means elevation) is a long, low ridge of  sand and gravel strata  occurring  in glaciated regions and formed by deposition of sediments from glacial melt water.

Eskers appear the same and are usually found in  Europe and North America regions occupying many  kilometres like railway lines.A very common example of such Eskers  is the Eiscir Riada, which runs 200km from Dublin  to Galway.

answer at the divergent plate boundary in the middle of the ocean;