geography coasts revision

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Abrasion (corrasion)
Bits of rock and sand in waves grind down cliff surfaces like sandpaper.
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Attrition
Waves smash rocks and pebbles on the shore into each other, and they break and become smoother.
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Hydraulic action
Air may become trapped in joints and cracks on a cliff face. When a wave breaks, the trapped air is compressed which weakens the cliff and causes erosion.
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Corrosion
Water dissolves minerals from the rocks and washes them away.
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Freezethaw
Water continually seeps into cracks, freezes and expands, eventually breaking the rock apart.
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Wetting/drying
Softer rocks (e.g. clay) expand when wet and contract when they dry out. Overtime this can weaken rocks and make them more easily eroded.
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Other cards in this set

Card 2

Front

Waves smash rocks and pebbles on the shore into each other, and they break and become smoother.

Back

Attrition

Card 3

Front

Air may become trapped in joints and cracks on a cliff face. When a wave breaks, the trapped air is compressed which weakens the cliff and causes erosion.

Back

Preview of the back of card 3

Card 4

Front

Water dissolves minerals from the rocks and washes them away.

Back

Preview of the back of card 4

Card 5

Front

Water continually seeps into cracks, freezes and expands, eventually breaking the rock apart.

Back

Preview of the back of card 5
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