The bottom or downward tip of a crevasse marks the ________.
A) boundary between parts of the glacier moving by sliding and crevassal slip
B) boundary between the sliding and external flowage zones
C) bottom of the sliding zone
D) top of the internal deformation and flowage zone

Question

Quizplus · Accepted Answer

The bottom or downward tip of a crevasse marks the top of the internal deformation and flowage zone, where the ice is brittle enough to fracture and form crevasses due to the stresses and strains imposed by the glacier's movement. The sliding and external flowage zones occur above this zone, where the ice is able to deform and flow without fracturing.

The Bottom or Downward Tip of a Crevasse Marks the ________