Regolith encompasses which part of the Earth's surface?

Regolith encompasses which part of the Earth's surface?

• A. The atmosphere
• B. Bedrock layers beneath the soil
• C. Soil horizons O, A, B, and C
• D. The ocean

Answer: (C)

Regolith is the loose, weathered material that sits on top of solid bedrock. It includes the soils and other unconsolidated debris produced by weathering, which means the soil layers you study—O, A, B, and C—are all part of regolith. The O horizon is the organic layer of leaf litter and decomposed matter, the A horizon is the mineral-rich topsoil, the B horizon is the subsoil where eluviated materials accumulate, and the C horizon consists of weathered parent rock approaching bedrock. These horizons together make up the regolith because they form the surface material that interacts with weather, water, and organisms, while the bedrock beneath remains solid rock and the atmosphere and the ocean are outside this loose surface layer. So the best answer is the one that includes these soil horizons O, A, B, and C.

Regolith is the loose, weathered material that sits on top of solid bedrock. It includes the soils and other unconsolidated debris produced by weathering, which means the soil layers you study—O, A, B, and C—are all part of regolith. The O horizon is the organic layer of leaf litter and decomposed matter, the A horizon is the mineral-rich topsoil, the B horizon is the subsoil where eluviated materials accumulate, and the C horizon consists of weathered parent rock approaching bedrock. These horizons together make up the regolith because they form the surface material that interacts with weather, water, and organisms, while the bedrock beneath remains solid rock and the atmosphere and the ocean are outside this loose surface layer. So the best answer is the one that includes these soil horizons O, A, B, and C.