Question

Which of the following best describes chemical weathering?

A process in which ice wears away at rocks over a long period of time
A series of changes that moves rocks from one area to another
Any small-scale event such as rain or fog
A process that changes the composition of rocks, causing them to break down

Answer 1

Answer:

Right Answer:-

• A process that changes the composition of rocks and causing them to break down.

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Answer 2

Chemical weathering is a process that changes the composition of rocks, causing them to break down.

Explanation:

• Chemical weathering is the weakening and subsequent disintegration of rock by chemical reactions.
• These reactions include oxidation,  hydrolysis, and carbonation.
• Oxidation- Oxidation is the reaction of rock minerals with oxygen, thus changing the mineral composition of the rock.
• Hydrolysis- Hydrolysis is a chemical reaction caused by water. Water changes the chemical composition and size of minerals in rock, making them less resistant to weathering.
• Carbonation- Carbonation is the process of rock minerals reacting with carbonic acid. Carbonic acid is formed when water combines with carbon dioxide. Carbonic acid dissolves or breaks down minerals in the rock.
• These processes either form or destroy minerals, thus altering the nature of the rock’s mineral composition.
• Temperature and moisture are critical for chemical weathering.
• Chemical weathering of rock minerals generally occurs more quickly in hot, humid climatic regions.