Weathering

Question 1

Mechanical weathering

Answer 1

Break down of rocks without changing the chemical composition

Question 2

Freeze thaw weathering

Answer 2

Happens when temps alternate from over to below 0°. Water enters rocks that have cracks like granite. When the water freezes it expands, putting pressure on the rock. When water thaws it contracts again putting pressure on the rock. Repeated freeze thawing widens crack and overtime the rock breaks up

Question 3

Thaw

Answer 3

Water changing from frozen to softer of liquid

Question 4

Chemical weathering

Answer 4

breakdown of rocks due to changing their chemical composition

Question 5

Example of chemical weathering.

Answer 5

Carbonate weathering- Rain water contains dissolved CO2 and this rain water dissolves certain rocks like limestone which contains calcium carbonate when it reacts.

Question 6

Biological weathering.

Answer 6

The break down of rock because of the actions of living organisms usually animals or plants.

Question 7

Example of biological weathering:

Answer 7

Tree roots grow on crack in rocks, as tree roots grow and widen the crack widens and overtime weakens and breaks