Coasts ; defenses

Question 1

Name 3 coastal defenses.

Answer 1

groynes
rock armour
sea wall
beach nourishment
(other valid answers)

Question 2

Describe groynes. Mention PROS and CONS.

Answer 2

a rigid structure that interrupts water flow and limits movement of sediment.
PROS: allows beach build up
CONS: can be unattractive, expensive

Question 3

Describe rock armour. Mention PROS and CONS.

Answer 3

boulders placed in front of a cliff to absorb wave energy.
PROS: allows beach buildup
CONS: expensive

Question 4

Describe sea wall. Mention PROS and CONS.

Answer 4

wall to prevent the sea from advancing on an area of land.
PROS: protects land and buildings from erosion.
CONS: expensive, unattractive

Question 5

Describe Beach nourishment. Mention PROS and CONS.

Answer 5

sediment lost is replaced.
PROS: widens the bed, natural and attractive .
CONS: easily eroded, expensive