Moraine Flashcards

1
Q

Where is lateral moraine found?

A

Sides of glaciers.

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2
Q

What is important in lateral moraine?

A

Scree from frost shattering is an important source.

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3
Q

Where is medial moraine found?

A

Down the middle of the glacier surface.

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4
Q

When does medial moraine occur?

A

When the inner lateral moraine of 2 glaciers join.

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5
Q

Where is ground moraine found?

A

At the base (bottom) of the ice.

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6
Q

What is ground moraine also called?

A

Till or boulder clay.

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7
Q

Where does ground moraine come from?

A

Abrasion on the base of the glacier.

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8
Q

Where is terminal moraine found?

A

In front of the snout of the glacier.

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9
Q

What does terminal moraine represent?

A

The maximum advance of the ice.

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10
Q

What moraine is the largest and widest?

A

Terminal moraine.

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11
Q

Where is recessional moraine found?

A

Behind terminal moraine, but not as wide or high.

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12
Q

What does recessional moraine mark?

A

Where the glacier has retreated and then stopped retreating depositing material.

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13
Q

Moraine is angular rock fragments, this includes what?

A

Rock fragments resulting from freeze-thaw weathering.

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14
Q

What is a basal slip?

A

Glacier sliding over the bed due to melt water under the ice acting as a lubricant.

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15
Q

What can basal slips sometimes cause?

A

Sudden movements in the glacier.

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16
Q

What is rotational slip?

A

If the slip surface is curved the slide said to be rotational.
Tends to be deep.