4. Coastal Erosion
-Hydraulic action: The waves trap and compress air in
cracks and holes in a cliff
-Corrasion: Large waves hurling beach material against
the cliff
-Attrition: When waves cause rocks and pebbles on the
beach to bump into each other and to break down in size
-Corrosion: Cliff is slowly dissolved by acids in the seawater

8. -Is the most
widespread coastal
deposition feature

11. -The natural rate of cliff erosion can be
accelerated by human activity. There are
arguments for and against trying to protect
cliffs from erosion.
-Occurs when the level
of the sea rises rapidly
to a height well above
that which was
predicted.

13. 1-Land behind the coastline is flat and low-lying
2-Severe storms can cause exceptionally high waves and create
storm surges
3-Very high tides can flood areas that are not protected
either naturally (by sand dunes) or artificially (by sea-walls)
4-Global warming is causing sea-level to rise, so increasing the
flood risk in many low-lying coastal areas around the world

14. Precautions in Coastal
Flooding