Coasts Mind-map
A easy to follow and colourful mind-map, that shows and tells you all you need to know about coast. The topics include: Longshore drift, mass movement, weathering, dunes, waves, salt marshes and spits :)
- Created by: Charlotte Griffiths
- Created on: 30-05-13 16:37
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- Coasts
- Weathering
- Mechanical
- Also known as physical weathering
- Chemical
- Invol;ves the action of chemicals (acid rain), dissolving rocks over time.
- Biological
- Involves the action of plants and animals, burrowing roots into cracks and rock faces.
- Mechanical
- Mass Movement
- This is the movement of large areas of rock as they downslope under the force of Gravity.
- Slde: a type of mass movement where large areas of coastal rock and soil, fall downwards from the cliff.
- Slump: a small distance of movement, that occurs when the movement is accelerated by it being saturated.
- Slde: a type of mass movement where large areas of coastal rock and soil, fall downwards from the cliff.
- This is the movement of large areas of rock as they downslope under the force of Gravity.
- Longshore Drift
- 1. Waves approach the beach at a slight angle
- 2. As the waves break, the SWASH carries the material up the becak at the same angle as the wave approached..
- 3. The BACKWASH and any material carried by it fall back down the beach, under the force of gravity.
- 4. The material is moved in a 'zig-zag' pattern.
- Spits
- 1. The prevailing winds, causes the sand and shingle to move along the beach.
- 2. The sand and shingle move beyond the beach and they are deposited in the calmer water behind the headland.
- 3. The Spit extends further into the sea. Marsh and Mudflats begin to form, as mud is deposited behind the spit.
- 4. Soon there is so much mud there, that salt-loving plants begin to grow.
- 5. The Saltmarsh eco-system is formed.
- Salt Marshes
- Areas of low-lying coastal wetland that is periodically flooded.
- Dynamic landscape
- Mud and Slit accumulate here.
- Salt-tolerant plants colonise, these are called Pioneer Plants.
- Dunes
- The marron grasses have long roots that hold the dunes together .. allowing more vegetation to develope and a natural HEATHLAND appears over the years.
- Waves
- 1. Waves are formed when the wind blows across the sea.
- 2. Out at sea, the wind tugs at the surface of the water, to make the wave shape move.
- 3. When a wave moves into shallower water, it is distorted until it 'breaks'.
- 4. The features of a wave are the crests and the trough.
- Constructive Wave
- Strong swash
- Weak backwash
- Shallow sides
- 7 waves a minute
- Destructive Wave
- Weak swash
- Strong backwash
- Steep sides
- 15 waves a minute
- Weathering
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