Coastal Processes L5

What is the definition of weathering?

• The removal of material from the coast by wave action

• The movement of material from one place to another

• The breakdown of rock in situ (in their original place)

• The laying down of material on the coast by the sea.

Which of the following are types of erosion?

• Freeze-Thaw

• Abrasion

• Attrition

• Solution

What is attrition?

• Build up of sediment on the cliff

• Rocks being thrown at the cliff

• Constant force of sea water crashing on cliff

• Rocks and pebbles breaking down as they smash into each other

Which of these can be the result of erosion?

• Coastal retreat

• Wave-cut platform

• Longshore drift

• Tides

What is longshore drift?

• Build up of sediment on the coastline

• Movement of material along the coast due to angled waves

• Prevailing wind moving at an angle

• Transportation of sediment away from the coastline

At which angle does backwash carry material back down the beach?

• 45 degrees

• 90 degrees

Under which conditions is deposition most likely?

• Little wind

• Waves enter a sheltered area

• Strong supply of material

• Beaches with a strong backwash

What's the top of a wave called?

• Trough

• Crest

• Height

What is wave frequency?

• The number of crests or troughs passing a stationary point per second

• The distance between one wave crest and another

• The time it takes for the wave to travel through one wave length

• The highest part of the wave

What is fetch?

• lowest part of the wave

• Height of the wave

• The length of water the wind has blown over

• The speed the wave is travelling