The Sea

Question 1

What are the characteristics of a destructive wave?

Answer 1

• Weak Swash

- Strong Backwash

Question 2

What are the 4 ways that the sea erodes the coast

Answer 2

1. Hydraulic Action
2. Air Compression
3. Abrasion
4. Attrition

Question 3

What are the characteristics of a constructive wave?

Answer 3

• Strong Swash

- Weak Backwash

Question 4

What are sea walls?

Answer 4

Concrete walls with curved tops to deflect the waves back to sea

Question 5

What are groynes?

Answer 5

Low walls built of wood, built at a right angle to the sea to prevent sand being moved by longshore drift

Question 6

What are gallions?

Answer 6

Wire cages filled with small stones in front of beaches or sand dunes. They break the power of the waves and slow down erosion