Weathering On A Coastline

Question 1

Salt weathering

Answer 1

1) caused by saline (salty water)
2) enters pores or cracks in a high tide
3) as tide goes out and the rocks dry, water evaporates forming salt crystals, they expand and put pressure on the rocks causing pieces of them to fall off

Question 2

Chemical weathering

Answer 2

1) breakdown of rock by changing its chemical composition
2) for example, carbon dioxide in the atmosphere dissolves in rainwater forming a weak carbonic acid
3) this reacts with a rock that contains calcium carbonate so rocks are gradually dissolved

Question 3

Freeze thaw

Answer 3

1) water freezing in cracks and expands under 0°c, once expanded this causes pieces of rock to fall off

Question 4

Wetting and drying

Answer 4

Water getting into clay on rocks and expanding, when dry, they break fragments and fall off