Flashcards
coasts-coastal erosion and weathering
Cards in this deck (10)
- 1hydraulic actionDestructive waves compress air into small cracks at the base of the cliff and when the backwash retreats there is a small explosion of released air pressure that weakens the rock.
- 2abrasionSmall pieces of rock are picked up by a wave and hurled against the cliff wearing it away.
- 3attritionPieces of rock are bumped together within the water and small chunks break off eventually creating small smooth pebbles.
- 4freeze-thawMechanical weathering- Water seeps into cracks in the rock during the day and at night the water freezes, expands and puts pressure on the crack widening it. Next day more water seeps in and the process repeats until a bit of the cliff breaks off.
- 5salt-weatheringMechanical weathering- (this can only happen in places where there is salty water). Salty water seeps into a crack in a rock. The water will then evaporate leaving behind the crystallised salt that begins to put pressure on the crack as more and more salt crystallises. Eventually a bit of rock will be detached
- 6weatheringThe breaking down of rock without moving it.
- 7carbonationCarbolic acid in rainwater reacts with limestone and dissolves it over time.
- 8hydrolisisAcidic rainwater causes the rocks to rot - producing clay and soluble salts.
- 9erosionThe breaking down of rocks and moving them from their starting position.
- 10oxidisationWater reacts with oxygen to rust rocks rich in iron weakening them and giving them a reddish colour.
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- GCSE Geography Flashcards on coasts-coastal erosion and weathering, created by Gabriel Keen on 04/11/2017.
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- Gabriel Keen
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