Question

The narrow gap formed between a glacier and a mountain wall is

Answer 1

Answer:

These gaps, created by rivers and glaciers, are called water gaps. Water gaps usually indicate the stream is older than the elevated area around it. ... (Moraine is the hilly debris left by a glacier as it carves its way through the earth.)

Answer 2

The narrow gap formed between a glacier and a mountain wall is water gaps.

• Gap is a low area between mountains or high elevated landmasses that is rugged and similar to passes.
• Water gaps are formed  by rivers and glaciers and are created by the tectonic activity.
• The tectonic uplift that occurred over million of years, resulted in the elevation of stream bed or stream channel and the stream weathered the rocks surrounding it.  
• The best example of water gap is Chicago Portage.