Part 3: Coastal change and conflict Flashcards
(43 cards)
- What is erosion?
a. Where rocks are broken down
- What is the fetch?
a. How far a wave has been blown by the wind
- What is the swash of a wave?
a. How strongly it comes up the beach
- What is the backwash of a wave?
a. How strongly it washes back down the beach
- What are destructive waves?
a. Waves which erode beaches
- What are the characteristics of a destructive wave?
a. weak swash
b. strong backwash
c. long fetch
- What sort of beaches are formed by destructive waves?
a. Steep
- What are the characteristics of a constructive wave?
a. strong swash
b. weak backwash
c. short fetch
- What sort of beaches are formed by constructive waves?
a. Gently sloping
- What is longshore drift?
a. A process where sand and pebbles are transported along the coastline
- How does longshore drift work?
a. The swash of a constructive waves brings sand and pebbles up the beach
b. The back wash takes it back
c. Material moves in a zig zag along the coastline
- What are the four types of erosion?
a. Attrition
b. Abrasion
c. Hydraulic action
d. Solution (Corrosion)
- How does attrition work?
a. Rocks knock into each other and break
- How does abrasion work?
a. Waves throw sand and pebbles at cliffs
b. The cliff wears away
- How does hydraulic action work?
a. Large waves break against a cliff
b. Air in the cliffs is compressed
c. The rock weakens
d. The rock shatters
- How does solution work?
a. Water dissolves the rock e.g. limestone
- What are depositional coastal features?
a. when new coastal features are built by longshore drift and constructive waves
- What is deposition
a. when new sand or pebbles are dropped (deposited) on the coast by the sea
- What is longshore drift?
a. When the sea carries materials along the coast
b. Material is carried up the beach in the direction the wind is blowing
c. It goes back down the beach in a straight line
d. The process is repeated
- What is a spit?
a. a line of sand or pebbles across the mouth of a river or bay
- How is a spit formed?
a. Longshore drift carries sand and pebbles along the coast
b. Sea water slows down at the mouth of a river
c. Sea water deposits sand or pebbles in the mouth of the river
d. Sand and pebbles form a line across the mouth of the river
- Give an example of a spit
a. Spurn Point on the Holderness Coast
- What is a bar?
a. a line of sand or pebbles cutting off a bay from the sea
- How is a bar formed?
a. Longshore drift carries sand and pebbles along the coast
b. Sea water slows down at a bay
c. Sea water deposits sand or pebbles in the mouth of the bay
d. A spit is formed all across the bay
e. The bay is cut off from the sea and becomes a lagoon