Its the breakdown of rock without changing its chemical compostion. It happens in freeze-thaw weathering. Water gets into cracks, freezes, expands and puts pressure on the rock
1 of 21
What is chemical weathering
Its the breakdown of rock by changing its chemical composition. Rain water has co2 in which makes a weak carbonic acid. This reacts with the rock
2 of 21
What are the four processes of errosion
Hydraulic power, abrasion, atrition, solution
3 of 21
What do destructive waves do
The errode the coast line as they high and steep and high frequency
4 of 21
What is a wave cut notch
The notch is enlarged with errosion making the cliff above unstable
5 of 21
How are headlands and bays formed
They are formed where there are alternating bands of resistant and less resistant rock
6 of 21
What are the 3 types of mass movement
Slides, Slumps, rockfalls
7 of 21
How are caves, arches, stacks and stumps formed
Water gets into cracks and enlarges them forming a cave. The water errodes the headland around the cave to form an arch. The arch collapses to form a stack. Stack warn away to form a stump
8 of 21
How are coves formed
When there are paralled bands of hard and soft rock. Hard rock along the coast with soft rock behind it
9 of 21
What are the 4 processes of transportation
Traction, suspension, saltation, solution
10 of 21
What is depostion
Dropping of material on the coast by the sea
11 of 21
What are constructive waves
They have a low frequency and are low and long. Carry material up the coast and cause depostion
12 of 21
How are beaches formed
Formed by depostion and constructive waves which drop material like sand and shingle
13 of 21
How are spits and bars formed
Formed by long shore drift until the shelterd area becomes a recurved end. The sheltered area is a bar and the recurved end is a spit
14 of 21
Dorset coast - errosion
Durdle Door, Lulworth cove, Chesil beach, Old Harry and his wife
15 of 21
Global warming
Melting ice causes waters in the oceans to rise. Increased global temperature causes the oceans to get warmer and expand
16 of 21
Four coastal areas at risk from flooding and errosion
Economic, social, political and environmental
17 of 21
Effects of coastal errosion
1.8 meters per year. It effects peoples lives and environment. Lives - destroy houses, businesses, property prices. Environment - seawater destroys natural lagoons and habitats as it is salty
18 of 21
Hard engineering
Sea wall , groynes, breakwaters, rock armour. Good because they are strong, last. Bad - cost
19 of 21
Soft engineering
Beach nourishment, Dune regeneration, Marsh creation, Managed retreat. Good - cheap. Bad - dont last
20 of 21
Conflicts between land use and conservation
Some human activities dont use the environment sustainably. Walking on sand dunes. We cause damage. Conservation like the National Trust develop a safe walkway so that we can still walk but not cause damage
21 of 21
Other cards in this set
Card 2
Front
What is chemical weathering
Back
Its the breakdown of rock by changing its chemical composition. Rain water has co2 in which makes a weak carbonic acid. This reacts with the rock
Comments
No comments have yet been made