Ch 6: Coastal Processes

Question 1

Coastal Erosion: Hydraulic Action

Answer 1

The force of the waves crashing against the coast erodes the coastline

Question 2

Coastal Erosion: Compressed air

Answer 2

The compression and expansion of air weakens the rock

Question 3

Coastal Erosion: Corrosive action

Answer 3

The sand and rock erode the coast further

Question 4

Bays and Headlands

Answer 4

The soft rocks are eroded much faster (bay) the harder rocks take longer time (headlands) e.g. Dublin Bay

Question 5

Cliff example

Answer 5

Cliffs of Moher, Co. Clare

Question 6

Blowhole

Answer 6

When the roof of a cave is eroded away

Question 7

Arches

Answer 7

formed when 2 caves meet

Question 8

Stack

Answer 8

formed when the arch collapses

Question 9

Stump

Answer 9

When a stack is eroded to sea level

Question 10

Swash

Answer 10

When waves hit the coast and the water runs up the beach

Question 11

Backwash

Answer 11

When the water runs back down the beach

Question 12

Long shore drift

Answer 12

When waves approach the coast at an angle

Question 13

Groynes

Answer 13

Force the sea to deposit its material

Question 14

Beach

Answer 14

Formed when waves deposit material along a gently sloping coast

Question 15

Spit

Answer 15

When deposited material builds up in the bay

Question 16

Bar

Answer 16

Formed when a spot connects 2 headlands

Question 17

Lagoon

Answer 17

Water behind the bar

Question 18

Tombolo

Answer 18

Then a spit or bar joins an island

Question 19

Sea walls

Answer 19

break the power of the wave

Question 20

Gabions

Answer 20

rectangular wire cages containing stones