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Geography > Denudation > Flashcards

Denudation Flashcards

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1
Q

Biological weathering

A

When plants and animals widen spaces between rocks making them crack,
Causes:
Tree roots
Animals digging holes

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2
Q

Freeze thaw action

A

In the day, water seeps between the cracks in the rocks.

At night the water freezes and expands, cracking the rocking and forcing it to crumble away

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3
Q

Denudation: definition

A

Breaking down and removal of solid and loose rocky materials on the earths crust

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4
Q

Chemical weathering

A

When rocks are dissolved because of chemical change,
Causes:
Rain

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5
Q

Exfoliation

A

Mechanical weathering - onion peeling - temperature suddenly changes causing outer skin of rock to shatter

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6
Q

Scree

A

Eroded pieces of rock

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7
Q

Causes of erosion

A

Moving water - rivers
Moving ice - glaciers
Moving air - wind

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8
Q

Areas between Grikes:

A

Clints

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9
Q

Mechanical weathering:

A

Rocks are broken into smaller pieces,
Causes:
Frost
Sudden temperature changes

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10
Q

Carbonation: definition

A

When rain falls it takes in CO2 and becomes a weak carbonic acid, it reacts with the calcium carbonate in limestone causing it to dissolve

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11
Q

Exposed areas of limestone:

A

Limestone pavement

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12
Q

Cracks in rocks:

A

Grikes

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13
Q

Landslides

A

When a slope becomes unstable resulting in the rapid movement of regolith down a steep slope

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14
Q

Erosion: definition

A

The breaking down of rocks and transportation of the material

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15
Q

Swallow holes: definition

A

Overtime Grikes become so big they become swallow holes

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16
Q

Stalactites:

A

Hang from the roof of caves - calcium carbonate seeps underground and hangs from ceiling

17
Q

Stalagmites

A

Come from the floor - calcium carbonate drops from stalagmites onto floor creating slagmites

18
Q

Weathering: definition

A

The breaking down of rocks that are exposed on the earths surface

19
Q

Karst landscape: definition

A

Landforms that develop on rock types which are easily dissolved by water

20
Q

Mass movement

A

Loose, weathered material that moves down slope under the influence of gravity

21
Q

Loose weathered material:

A

Regolith

22
Q

Factors of mass movement:(4)

A

The gradient
The water content
Human activity
Plants and trees

23
Q

Soil creep:

A

Slowest type of mass movement, soil moves in layers on surface

24
Q

Bog bursts

A

Upland slopes where the layers of peat on the bog land become saturated with rain

25
Q

Mudflow

A

When saturated regality flows rapidly down slopes

Geography (4 decks)

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