Subglacial Processes

What goes on below?

Plastic Glacier Flow, Hargreaves Glacier, BC, Canada	Tunnel in Angel Glacier, Canada	Subglacial Stratigraphy, Alberta, Canada	Basal Ice on Iceberg 2, AK	Basal Ice on Iceberg 1, AK

Kelley's Island Grooves, Ohio

or perhaps Lecture 4 - Glacier Abrasion