10.2 + 10.3

Question 1

Explain corrasion/abrasion

Answer 1

Sand and pebbles carried within waves are thrown against the cliff face with considerable force. These particles break off more rocks from the cliff which in turn are thrown against the cliff by the breaking wave

Question 2

Explain hydraulic action

Answer 2

The pressure of water being thrown at the cliffs by the waves. Also includes the compression of air in cracks. Water gets into the cracks in cliffs and compresses the air forcing pieces of rock to break off

Question 3

Explain attrition

Answer 3

The wearing away of rocks in the sea. Boulders continually roll around and chip away at each other until smooth pebbles or sand is formed

Question 4

Explain corrosion

Answer 4

A chemical reaction between certain rock types, the salt and other acids in seawater. With limestone cliffs, the water turns milky blue to show dissolved limestone.