Question

How is physical weathering different from chemical weathering?

A. Physical weathering is always faster than chemical weathering.
B. In chemical weathering, the composition of the weathered substance is changed.
C. In physical weathering, the composition of the weather substance is changed.
D. Chemical weathering is always faster than physical weathering.​

Answer 1

B. In chemical weathering, the composition of the weathered substance is changed.

Chemical weathering involves the alteration of the composition of rocks and minerals through chemical reactions. During this process, the minerals within the rock react with substances in the surrounding environment, such as water, acids, oxygen, and other chemicals. These reactions can result in the formation of new minerals or the dissolution of existing minerals, leading to a change in the composition of the weathered substance. For example, when rainwater reacts with limestone, it can dissolve the calcium carbonate in the rock, causing it to undergo chemical changes and potentially forming caves or sinkholes. In contrast, physical weathering refers to the physical breakdown of rocks into smaller fragments without changing their chemical composition. Therefore, the correct answer is [B. In chemical weathering, the composition of the weathered substance is changed.]

Step-by-step explanation:

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Answer 2

B. In chemical weathering, the composition of the weathered substance is changed.

Step-by-step explanation:

Physical weathering breaks rocks into smaller pieces without changing their composition, while chemical weathering changes the composition of rocks through chemical reactions.