Question

how is chemical weathering best described?
it is the build up of chemical deposits on the surface of rock
it is the breakdown of rock through mechanical disintegration and physical stress
the buildup of rock formations over time
the breakdown of rock by a change in its chemical composition

Explanation:

Chemical weathering involves a chemical change in the rock. Let's analyze each option:

• Option 1: Chemical weathering is not about building - up deposits but breaking down.
• Option 2: Mechanical disintegration and physical stress are related to physical weathering, not chemical.
• Option 3: Buildup of rock formations over time is not chemical weathering.
• Option 4: Chemical weathering occurs when there is a change in the rock's chemical composition, leading to its breakdown.

Answer:

The breakdown of rock by a change in its chemical composition.