QuestionMay 6, 2025

(Q006) Limestones are easily eroded in humid regions. In arid regions, limestones are more resistant and can form cliffs because of the scarcity of water. cannot exist because they are chemical or biochemical rocks. form in playa lakes. develop karst topography.

(Q006) Limestones are easily eroded in humid regions. In arid regions, limestones are more resistant and can form cliffs because of the scarcity of water. cannot exist because they are chemical or biochemical rocks. form in playa lakes. develop karst topography.
(Q006) Limestones are easily eroded in humid regions. In arid regions, limestones are more resistant and can form cliffs because of the scarcity of water. cannot exist because they are chemical or biochemical rocks. form in playa lakes. develop karst topography.

Solution
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Answer

A. Form cliffs because of the scarcity of water Explanation 1. Analyze the behavior of limestone in different climates Limestone is a sedimentary rock primarily composed of calcium carbonate (CaCO₃). In humid regions, it is easily eroded due to chemical weathering caused by water and carbon dioxide forming carbonic acid. In arid regions, the scarcity of water reduces chemical weathering, making limestone more resistant and capable of forming cliffs. 2. Evaluate the options - "Form cliffs because of the scarcity of water" aligns with the explanation above. - "Cannot exist because they are chemical or biochemical rocks" is incorrect; limestones can exist in both humid and arid regions. - "Form in playa lakes" is unrelated to the question's context. - "Develop karst topography" occurs in humid regions, not arid ones.

Explanation

1. Analyze the behavior of limestone in different climates<br /> Limestone is a sedimentary rock primarily composed of calcium carbonate (CaCO₃). In humid regions, it is easily eroded due to chemical weathering caused by water and carbon dioxide forming carbonic acid. In arid regions, the scarcity of water reduces chemical weathering, making limestone more resistant and capable of forming cliffs.<br />2. Evaluate the options<br /> - "Form cliffs because of the scarcity of water" aligns with the explanation above.<br /> - "Cannot exist because they are chemical or biochemical rocks" is incorrect; limestones can exist in both humid and arid regions.<br /> - "Form in playa lakes" is unrelated to the question's context.<br /> - "Develop karst topography" occurs in humid regions, not arid ones.
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