GEOG 2051 : Geog2051 Exam3 AllNotes
Document Summary
If tilt was greater, the seasons would be way more extreme: varies on a cycle of about 40,000 yrs, 22-24 degree tilt, axial direction, varies on cycle of about 75,000 yrs. Ice flows from accumulation zone to ablation zone: glacial movement, glacial ice is different than ice in our fridge, brittle zone. Ice is similar to ice in our fridge: hard, brittle, will fracture, when ice tries to move across a zone, it stretched and cracks, created crevasses, plastic zone. Ice in this zone is physically different: because of the pressure exerted on this ice from above ice, it literally bends and stretches as though it was a plastic. Periglacial environments frost action: physical weathering is dominant, freeze-thaw is dominant, water seeps into cracks and then freezes, expanding and breaking up ground, water seeps into crack, freezes, and then expands this cycle continues and. Ice roads are built across lakes to transport resources huge deposits of oil up there.
