What process describes the breakdown of rock into smaller components by atmospheric and biotic actions?

• A. Erosion
• B. Weathering
• C. Mass wasting
• D. Denudation

Answer: (B)

The process that describes the breakdown of rock into smaller components due to atmospheric and biotic actions is weathering. Weathering involves the physical and chemical processes that contribute to the disintegration and decomposition of rocks at or near the Earth's surface. This can occur through various mechanisms such as temperature changes, water, ice, and biological organisms that physically or chemically alter the rock material. For instance, the growth of plant roots can exert pressure on rocks, contributing to their breakdown, while chemical reactions with water can alter the mineral composition of the rock itself.

In contrast, erosion refers to the movement of sediment and soil from one location to another, usually caused by wind, water, or ice, after the material has already been weathered. Mass wasting involves the downhill movement of soil and rock due to gravity, and denudation encompasses the processes that wear away the Earth's surface, which can include both weathering and erosion. However, none of these processes specifically focus on the breakdown of the rock itself like weathering does.