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Geoghraphy > Glaciers > Flashcards

Glaciers Flashcards

1
Q

What is relief of land ?

A

The natural features of land

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2
Q

What is topography ?

A

The highest and lowest point in the area

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3
Q

Example of lowlands ?

A

The fens in East Anglia

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4
Q

Example of highlands ?

A

Lake District

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5
Q

Factors of last ice age

A

20,000 years ago

Ice was 3 km thick

Glacial period = when temperatures drop significantly

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6
Q

What is a glacier ?

A

A body of ice constantly moving under its own height. It was made by snow build up over many years

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7
Q

Freeze thaw weathering ?

A

Water enters a crevice in a rock

Water freezes and expands

Crevice expands

Cracks in rock get larger over time

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8
Q

What is Glacial weathering ?

A

The breakdown of rocks by the action of rain water or extreme temperatures

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9
Q

What is glacial erosion ?

A

The wearing away of land by flowing water or ice

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10
Q

What is abrasion ?

A

Rocks at bottom of glacier grind over the bedrock

Leaves sharp grooves called striations

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11
Q

What is plucking ?

A

Water form glacier surrounds rock

Water refreezes and rock becomes part of glacier

Rock is ripped out as glacier moves

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12
Q

What is sediment transported by a glacier called ?

A

Till

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13
Q

What is a corrie ?

A

Bowl shaped hollow with steep back wall (êrete) and sometimes have a small lake (tarn)

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14
Q

How does a corrie form ?

A
  1. Snow accumulates on top of a slope
  2. Ice becomes frozen and plucking occurs, this makes the back wall steeper
  3. Freeze thaw weathering occurs
  4. Abrasion occurs
  5. Glacier leaves till at front which forms a lip
  6. When all ice melts a tarn forms.
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15
Q

3 types of moraine

A

Medial - in middle

Lateral - on side (latissimus dorsi)

Ground moraine - on bottom

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16
Q

Drumlins ?

A

Egg shaped hills which show the direction a glacier has moved

17
Q

Lake District economic activities ?

A

Forestry
Farming
Tourism
Mining

18
Q

What is glacial trough ?

A

Ice pushed material in front of it

19
Q

What does meltwater do at the snout of a glacier ?

A

Transport debris away form the glacier

20
Q

When does material get deposited by a glacier ? (And what is it like)

A

When it melts

(Small and Rounded due to attrition)

21
Q

What are erratics ?

A

Frost shattered rock eroded form the ground and transported by glacier

Geoghraphy (3 decks)

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