Glaciers. Glaciers are piles of snow that flow under their own weight. They are capable of enormous erosion and deposition, mainly because of the near-lack of limits on transportation and their close association with freeze-thaw cycles that produce much physical weathering.
v 0035 of 'Glaciers' by Greg Pouch at 2013-10-14 19:56:03 LastSavedBeforeThis 2011-02-21 16:48:10 13Glaciers.ppt
3 Glacial Processes > Rheology
4 Glacial Processes > Formation
5 Glacial Processes > Flow
6 Causes of Glaciers
7 Erosion > Continental
8 Erosion > Alpine
9 Diagram of alpine erosional features
10 Paternoster and Rosary
11 Deposition > Materials
12 Deposition > Features
13 Continental Deposition Figures II
14 Meanwhile, back in the tropics…
In the recent past, there have been four major ice ages with warm inter-glacials between. This happens with surprising regularity.
There have been at least three other glacial epochs further in the past we know of. (The odds of preservation seem low, so there could be others we don't know about.)
This refers to glaciers that cover big areas (ice caps) or huge areas (ice sheets) and are not confined by channels. They flow under their own weight with little regard to underlying topography. They do not leave spectacular scenery.
These erosional features are also common in alpine glaciation.
Alpine Glaciation refers to glaciers that form at high altitude in mountain chains. Under these conditions, the glaciers move in stream-like fashion down channels, widening and deepening them.