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Geography Summer Exams > Denudation > Flashcards

Denudation Flashcards

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1
Q

What is weathering

A

Weathering is the break down of rocks from exposure to weather

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2
Q

What is erosion

A

Erosion is the breakdown of rocks and removal of particles

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3
Q

What does erosion remove

A

Scree/particles

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4
Q

What are the two types of weathering

A

Mechanical and chemical

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5
Q

How is erosion caused

A

Caused by moving air (wind) moving water (lake, sea) moving ice (glacier)

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6
Q

What does mechanical weathering do?

A

Breaks the rock into smaller pieces

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7
Q

Name one type of mechanical weathering

A

Freeze thaw action

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8
Q

Where does freeze thaw action occur

A

High in the mountains where there is lots of rain and the tempature rises and drops below 0 degrees often

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9
Q

Stage one of frees thaw action

A

During the day water seeps into the cracks in the rocks

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10
Q

Stage two freeze thaw action

A

At night tempature so fall below freezing point the water in the cracks freezes and expands (10%) putting pressure on the rock

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11
Q

Stage three freeze thaw action

A

Over time this process continues to occur weakening the rock and eventually forcing a piece to break off. The broken rock is known as scree

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12
Q

What does chemical weathering do

A

Dissolves rock

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13
Q

What is one example of chemical weathering

A

Carbonation

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14
Q

Where does carbonation occur

A

Limestone landscapes

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15
Q

How does carbonation occur

A

Rainwater mixes with carbon dioxide in the atmosphere forming a weak carbonic acid

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16
Q

What does the weak acid carbonation react with

A

Calcium carbonate in the limestone

17
Q

What are areas where limestone is exposed to weather known as

A

Karst landscapes

18
Q

State an example of a karst landscape

A

Burden county Clare

19
Q

Limestone pavement

A

Series of clints, grikes and joints

20
Q

Clint

A

Block of limestone between grikes

21
Q

Grikes

A

Narrow gaps between blacks of limestone formed by rainwater and acid

22
Q

Swallow hole

A

Disappearing river hoes underground when reaches limestone pavement

23
Q

Pollnagollum

A

Swallow hole in the burren

24
Q

Caverns

A

Enlarged caves

25
Q

Caves

A

Enlarged passages due to carbonation

26
Q

Stalactites

A

Build up of calcite hung like icicles on roof of cave

27
Q

Calcite

A

Pure limestone left from evaporation

28
Q

Stalagmites

A

Build up of pure calcite on ground

29
Q

Pillar

A

Stalactites and stalagmites meet

Geography Summer Exams (14 decks)

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