Weathering

Question 1

What is mechanical weathering

Answer 1

The breaking down of larger rock into smaller rock

Question 2

Example of mechanical weathering

Answer 2

Freeze thaw weathering

Question 3

What is chemical weathering?

Answer 3

A chemical reaction occurs in the rock causing it to devolve and form new substances.

Question 4

Example of chemical weathering

Answer 4

Limestone dissolves by rainwater forming calcium carbonate in caves.

Question 5

What is biological weathering?

Answer 5

Disintegration of rocks due to the actions of plants/ animals

Question 6

What is meant by exfoliation?

Answer 6

it occurs when sheets or layers of rock split off due to thermal expansion and contraction of minerals.

Question 7

Explain freeze thaw weathering

Answer 7

Water expands when it freezes and exerts a mechanical force on the rocks surrounding it.

Question 8

what is root action?

Answer 8

causes the mechanical and chemical weathering of rocks by the wedging action of a plant roots that may grow along joints and bedding planes.

Question 9

What is burrowing?

Answer 9

Burrowing mixes and brings rock and soil particles to the surface. This facilitates chemical weathering at greater depth, as the burrows can be accessed by atmospheric gas and water.

Question 10

How does chemical weathering work?

Answer 10

Rocks decompose when the chemical structure of their minerals breaks down.

Question 11

What do chemical weathering reactions produce?

Answer 11

All chemical weathering reactions involve water and produce ions that are removed in solution, leaving an insoluble residue, usually clay minerals.