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Geology > Glaciers Ch. 17 > Flashcards

Glaciers Ch. 17 Flashcards

1
Q

Glacier

A

thick mass of ice

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2
Q

formation

A

snow flakes, granular snow, firn, glacial ice

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3
Q

Occurs within the ice

• Under pressure, ice is plastic

A

Internal deformation

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4
Q

• Entire ice mass slipping

along the ground

A

BASAL SLIP

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5
Q

Acts like a hydraulic jack,

lifting ice to move over rock

A

MELT WATER

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6
Q

Zone of fracture

A
  • Upper 50 metres

* Tension causes crevasses to form in brittle ice

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7
Q

surges

A

RAPID MOVEMENT

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8
Q

ice advances

A

if accumulation exceeds loss

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9
Q

Zone of accumulation

A

where the glacier forms

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10
Q

zone of ablation

A

where there is a net loss to the glacier

• Lower limit is the equilibrium line

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11
Q

Calving –

A

breaking off of large pieces of ice into water

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12
Q

abration

A

Rocks in ice acting like sandpaper

• Produces rock flour and glacial striations

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13
Q

plucking (hint base of glacier)

A

Lifting and transport of rock blocks (Erratics) at the base of the glacier

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14
Q

hanging valleys

A

ABOVE GLACIER

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15
Q

lacial trough (U shaped)

A

• Transformed by deepening,

widening & straightening

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16
Q

Cirque

A

Head of glacier

17
Q

Tarn (hint: related to cirque)

A

Lake in a Cirque

18
Q

arete

A

Sharp Ridge

19
Q

horn

A

Pyramid Mt

20
Q

spur

A

Triangular Cliff

21
Q

Roche moutonnées

A

asymmetric bedrock knobs with steep sides indicating direction of ice movement

22
Q

fjord

A

water-filled glacial trough along a coast

23
Q

till

A

Material deposited directly by glacial ice

24
Q

stratified

A

Sediments laid down by meltwater

25
Q

Lateral moraines

A

parallel ridges of debris deposited along the sides of a glacier

26
Q

medials

A

where glaciers merge

Geology (14 decks)

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