Physical Weathering

Question 1

Freeze thaw

Answer 1

• water trickles cracks such as joints during the day, at night this expands about 10% and widens the cracks making small parts of the rock fall off

Question 2

Heating & cooling (thermal fracture)

Answer 2

• large ranges of temperature in desserts, cause rocks and minerals to expand during the daytime and contract during the night resulting in disintegration

Question 3

Salt crystal

Answer 3

• when salt solutions in the pores or joints of a rock crystallise. The crystals expand force the rock apart