Question

Which of the following is a pre-condition for chemical weathering to take place?

Options

• Water

• Air

• Both water and air

• Neither water nor air

Answer 1

Both water and air

Explanation:

Chemical weathering requires both water and air (gases) as pre-conditions because minerals in rocks change chemically due to reactions with water and gases like oxygen and carbon dioxide in the air. This process is enhanced by the presence of both elements together.