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Author Question: Do you think there is a water table beneath the sea? Beneath lakes? What will be an ideal ... (Read 78 times)

Bob-Dole

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on: Jul 16, 2018
Do you think there is a water table beneath the sea? Beneath lakes?
 
  What will be an ideal response?

Question 2

Describe how glaciers erode rock and carry sediment.
 
  What will be an ideal response?


Ptupou85

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Reply #1 on: Jul 16, 2018
Answer to Question 1

Sediments on the ocean floor are saturated with water. Beneath lakes, it is possible to have an unsaturated zone, and a saturated zone below that.

Answer to Question 2

Shear stress increases with the increasing weight of the glacier, so a thick glacier exerts great shear stress on the bed and also on valley walls. This shear stress allows the moving ice to pluck rock and to abrade the rock because of fragments frozen into the ice. Water flowing beneath a glacier alternately freezes and thaws, which further dislodges rock fragments that may then freeze into the base of the glacier where they are carried along and may contribute to further rock abrasion. Water under the glacier commonly flows at high pressure, which enhances erosion potential and permits the water to carry eroded debris out from beneath the glacier.


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