Coastal Weathering

Question 1

Mechanical Weathering

Answer 1

Is the break down of rocks without any chemicals change e.g freeze thaw Weathering

Question 2

Freeze thaw

Answer 2

Water enters crack e.g granite
Water 💦 freeze and expands 9% and gives the rock pressure
It thaws and contracts releasing pressures when melted
This continues to make cracks

Question 3

Chemical Weathering

Answer 3

Breakdown of rock by changing its composition

Question 4

Carbonation Weathering

Answer 4

Rainwater has co2 dissolve in it which makes it a weak carbonic acid
This reacts with rock that contains calcium carbonate e.g limestone so rocks are dissolved in it

Question 5

Mass movement

Answer 5

Shifting of rocks down slope by the force of gravity acting on the slope is greater than the force supporting

Question 6

Mass movement causes coast to

Answer 6

Retreat rapidly

Question 7

Slides mass movement

Answer 7

Material shifts in a straight line

Question 8

Slumps mass movement

Answer 8

Material shifts with a rotation

Question 9

Rockfall

Answer 9

Material breaks up and falls down slope

Question 10

Mass movement is likely when

Answer 10

Materials are filled with water it acts like a lubricant

Question 11

Swash

Answer 11

Movement of water on beach

Question 12

Backwash

Answer 12

Movement of water back into the sea

Question 13

Crest

Answer 13

Top of the wave

Question 14

Trough

Answer 14

The base of the wave

Question 15

Wave height

Answer 15

The vertical distance from trough to crest

Question 16

Wave length

Answer 16

The horizontal distance between two crest

Question 17

Wave frequency

Answer 17

The number of waves breaking per minute

Question 18

Fetch

Answer 18

The distance of open water over which the wind can blow the longer the fetch the more powerful the wave can become

Question 19

Constructive waves

Answer 19

Weak backwash strong swash
Builds up beach
Long length low frequency

Question 20

Constructive waves waves

Answer 20

strong swash as they have lots of energy which pushes the material up beach but little energy is left for the backwash

Question 21

Destructive waves

Answer 21

Weak swash strong back wash
Remove sediments of beach
Creates stumps and arches

Question 22

Destructive waves waves

Answer 22

Strong length high frequency

Strong back wash as they have plenty of energy left from swash