3.2 Weathering Flashcards

1
Q

What is weathering?

A

The breakdown of rocks by the elements of the weather in exception for wind

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2
Q

What are the two types of weathering?

A

Physical and Chemical

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3
Q

What is physical weathering?

A

The breakdown of rocks into smaller fragments

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4
Q

What are the 5 types of physical weathering?

A
  • Freeze-Thaw
  • Exfoliation
  • Salt Crystallisation
  • Pressure Release
  • Tree roots
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5
Q

What is freeze-thaw weathering?

A

Water enters cracks/joints and then expand when it freezes then repeats as it goes back above 0 degrees

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6
Q

What is exfoliation weathering?

A

Rock expanding when heated and contracting when cooled, the outer layer cracks as it receives more heat than the inner layer

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7
Q

What is salt crystallisation weathering?

A

Solutions of salt can get into the pores and the salts precipitate, growing crystals which these expand

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8
Q

What is pressure release weathering?

A

Overlying rocks is removed by erosion the underlying rock expands

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9
Q

What is tree root weathering?

A

Tree roots grow into the cracks/joints of a rock and exert outwards pressure

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10
Q

What is chemical weathering?

A

Chemical reactions between elements of the weather and mineral within the rock

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11
Q

What are the 6 types of chemical weathering?

A
  • Carbonation
  • Hydration
  • Oxidation
  • Solution
  • Hydrolysis
  • Organic Acids
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12
Q

What is carbonation weathering?

A

Carbonic acid being created which reacts with calcium carbonate in rocks and they dissolve

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13
Q

What is hydration weathering?

A

Water molecules added to minerals in rocks, causing chemical reactions

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14
Q

What is oxidation weathering?

A

Some minerals in rocks such as iron based minerals react with oxygen in the air

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15
Q

What is solution weathering?

A

Some minerals dissolve in water overtime due to the lower PH

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16
Q

What is hydrolysis weathering?

A

Chemical reactions between rock minerals and water such as formation of clay

17
Q

What is organic acid weathering?

A

Organic acids which are formed by the decomposition of litter which causes soil water to become more acidic and react with minerals

18
Q

What are the main type of factors that effect weathering?

A

Climate, Geology, Relief, Vegetation and human activity

19
Q

How does higher temperature effect climate weathering?

A

Faster Chemical Reactions

20
Q

How does higher precipitation effect climate weathering?

A

Dead leaves release more organic acids

21
Q

How does a temperature around 0 degrees effect climate weathering?

A

Freeze Thaw Occurs

22
Q

How does more moisture effect climate weathering?

A

More chemical reactions

23
Q

How does a larger diurnal range effect climate weathering?

A

More exfoliation

24
Q

How does more pores effect geological weathering?

A

Water gets inside the rock more often

25
Q

How does the rock composition (Minerals Inside) effect geological weathering?

A

If there is Iron than Oxidation will occur

26
Q

How does the amount of joints/cracks effect geological weathering?

A

Weathering happens more

27
Q

What are the different ways relief can effect weathering?

A
  • Slope/Height
  • Water Moving and Collecting
  • Aspect
  • Altitude temperature
28
Q

What are the different ways Vegetation can effect weathering?

A
  • Tree Root occurs when there is vegetation
  • More organic acids due to more dead leaves
  • Interception
29
Q

What are the different ways Human Activity can effect weathering?

A
  • Producing greenhouse gases leads to higher acidity precipitation and therefore more weathering
  • Global warming lead to increased temperature