landforms construct past ice extent Flashcards

(5 cards)

1
Q

terminal moraine

A

-give evidence of glaciers furthest extent
-glacial geologists compile data bases and maps of these moraines, interpolating between them and creating past ice extent maps

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2
Q

drumlins and crag & tail

A

-indicate direction of ice flow
- Drumlins in Vale of Eden (Cumbria) show ice moved eastwards

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3
Q

erratics

A

-give clues on direction of movement
-work out source = work out origin

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4
Q

corries, aretes, glacial troughs

A

-leaves relict glaciateed landscapes that show evidence of previous ice coverage e.g. Snowdonia, lake district show most of country covered in Devensian
-distinctive glacial features e.g. steep back wall and steep sided, narrow ridges (aretes)

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5
Q

striations and polished rock surfaces

A

-microscale features can help show extent of coverage
-despite small size, link between striations and process of basal slip means they can be used to infer former presence of a glacier, direction of ice flow, mechanism of flow, and thermal reigme of glacier

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