How ice erodes
Remember, ice erodes by:
Plucking - glacier ice freezes into cracks in rocks and when the glacier moves it pulls out chunks to leave a jagged surface
Abrasion - rocks stuck in the ice grind away the bedrock under the glacier
Freeze Thaw - water in cracks in the rock freezes and expands forcing open the gap. When the ice melts more water can get into the crack and freeze again. After many cycles of freezing and thawing lumps of rock are broken off the surface.
You must be able to dsecribe these processes in the credit exam eg do not simply say that corries are formed by plucking and abrasion - tell me what the processes actually do!
Subscribe to:
Post Comments (Atom)
No comments:
Post a Comment