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Author Question: How does ground moraine form? Relate the formation of ground moraine to changes in climate. What ... (Read 61 times)

NClaborn

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on: Jul 15, 2018
How does ground moraine form? Relate the formation of ground moraine to changes in climate.
 
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Question 2

North American glaciations used to be described in four episodes. However, two of those episode names, the Kansan and Nebraskan, are no longer used. What evidence did scientists use to redefine the glacial history on the North American continent?
 
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voltaire123

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Reply #1 on: Jul 15, 2018
Answer to Question 1

Answer: Ground moraines form when ablation exceeds the nourishment of a glacier. The glacial ice is still flowing forward, but the terminus is retreating, so the sediment melting out of the ice form is deposited on the ground as the terminus retreats, creating an undulating plain strewn with rocks. This process relates to climate change because glacial retreat generally indicates a warming climate.

Answer to Question 2

Answer: Ocean cores show evidence for up to 20 glaciations, not simply 4.


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