1.1.5: More coastal processes Flashcards

1
Q

Sub aerial weathering

is where

A

above

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Physical and mechanical weathering

A

Breaks off rocks of varying sizes which fall to the foot of the cliff and protect it from erosion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

2 types of physical and mechanical weathering

A
  • freeze thaw

- seawater gets in cracks

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Freeze thaw weathering

A

(wetting and drying)
water layer,
expansion and contraction of minerals

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Where does freeze thaw occur

A

macrotidal environments

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What is freeze thaw most effective on

A

clay

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Sea water gets in cracks weathering

A

cracks in rocks
evaporates
crystals left behind which grow
exert pressure on the rock causing it to break apart

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

3 types of weathering

A

physical/mechanical
chemical
biotic

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

5 types of chemical weathering

A
solution
hydration
hydrolysis
oxidation
chelation
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Solution

chemical weathering

A

solubility of minerals

depends on temp and acidity of the water

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Hydration

chemical weathering

A

Minerals absorb water which weakens their structure

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Hydrolysis

chemical weathering

A

Reaction between minerals and water
related to hydrogen ion conc in water
affects granite

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Oxidation

chemical weathering

A

Adding or removing O2
often affects rocks with a high iron content
common under water logged conditions

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Chelation

chemical weathering

A

Organic acids are produced by plant roots and decaying organic matter = weathering

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Biotic weathering

A

Caused by plant roots or animals burrowing

can cause softer rocks to break apart

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

4 types of mass movement

A
  • rock fall
  • rock slide
  • rock toppling
  • rotational slides and slumps
17
Q

Rock fall

mass movement type

A

Rocks dislodged by weathering fall to the bottom of the cliff

18
Q

Rock slide

mass movement type

A

rocks slide to the bottom of the cliff

19
Q

Rock toppling

mass movement type

A

Blocks/columns weakened by weathering fall seawards

20
Q

Rotational slides and slumps

mass movement type

A

Sections of the cliff give way along a layer

the fallen material stays as an identifiable mass off shore

21
Q

Cliff

A

any coastal slope affected by marine processes

22
Q

Geology

A

type of rock affects profile of cliffs and shore platforms

eg: igneous rocks form steep cliffs

23
Q

Marine or sub aerial processes

A

high wave energy needed to remove debris at the foot of a cliff

24
Q

Inherited characteristics

A

The sea can re-work landscapes created by non-marine processes
such as glaciation

25
Q

Sequence of erosion beginning with caves

A

cave > arch > stack > stump

CASS

26
Q

Geo

A

A geo is a long, narrow inlet which has been formed by erosion causing the roof of a cave to collapse or along a line of weakness

27
Q

Blowhole

A

A verticle shaft that goes up to the the surface created by air and water forced into a cave by waves