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coast erosion
Question | Answer |
---|---|
hydraulic action | erosive power of waves, fractures the rock enlarges joints weakens coastlines |
abrasion | load hits off coastline |
attrition | rock collide worn down pebbles become round |
compression | waves compress air in cracks |
solution | dissolved by salt |
what are bays | bays are curved indents on coastline formed from destructive waves eg liscannor bay |
whats a headland | a section of land that protrudes further into the sea than the surrounding coast eg mizen head slea head |
how are they formed | bays an headlands are formed where bands of hard rock and bands of soft are beside another |
what is differential erosion | as a destructive waves attack the coast the less resistant rock is eroded much faster |
what are the processes | hydraulic action and compression are the tow most common and effective processess |
c ompressed air | as the incoming waves hit off the coastline air is trapped and compressed, as the wave retreats the air escapes with an explosive effect |
what is wave refraction | shallow waters around the headlland create friction slowing own the wave flowing towards it. The section of wave in deeper water continues at its normal speed |