Landforms of glacial erosion - Hanging Valleys

Question 1

What do hanging valleys relate to?

Answer 1

Hanging valley’s relate to pre-glacial tributary streams feeding the main river channel.

Question 2

What does glacial over deepening of the main valley by the main glacier leave?

Answer 2

Glacial over-deepening of the main valley by the main glacier leaves the less-eroded tributary valley (with less ice mass and moraine, so eroding less) hanging over the main trough.

Question 3

What is post-glacial modification of a hanging valley often evidenced by?

Answer 3

A waterfall cascading over the edge