Coasts

Question 1

Wave-Cut Platform

Answer 1

• <erosion at base of cliff from destructive wave
• Abrasion
• loose rocks used for ammuniation
• Hydraulic action
• Wave cut notch
• Notch gets bigger and cliff collapses
• Materials provides temp protection
• Cliff retreats creating a wave-cut platform
• Erosive power decreases
• Freeze thaw makes cliff slope gentler

Question 2

Headlands and Bays

Answer 2

• Discordant coasts
• Alternating bands of hard and soft rock
• Abrasion
• Hydraulic action
• Differential erosion
• Waves cant erode hard rock forming headlands
• Headlands protect bay from waves and slows down erosion
• Bays recieve constructive waves to form beach

Question 3

Stump

Answer 3

• Caves form when destructive waves attack weaknesses
• Abrasion
• Hydraulic action
• Solution
• Horizontal erosion cuts through headland forms arch
• Blowhole when compressed air forces up
• Waves eroded bottom of arch then collapses leaving stack
• Futher erosion causes stack to fall leaving stump
• Old Harry

Question 4

Sand Spit

Answer 4

• Longshore drift
• Swash
• Backwash
• Coastline changes direction allows for deposition
• Material builds above water
• Deposits > erosion spit develops
• Hooked end when wind changes
• Salt marsh
• Spurn Head

Question 5

Sand Bar

Answer 5

• Longshore drift
• Swash
• Backwash
• Coastline changes direction allows for deposition
• Material builds above water
• Deposits > erosion spit develops
• Spit reaches other side of bay forms bar
• Lagoon