What term describes loose rock fragments and clay derived from weathered rock mixed with organic material?

What term describes loose rock fragments and clay derived from weathered rock mixed with organic material?

• A. Regolith
• B. Sediment
• C. Soil
• D. Bedrock

Answer: (C)

The concept here is the difference between surface materials formed by weathering and life processes. The description points to soil: a layer of loose mineral particles produced by weathering (rocks breaking down to fragments and clay) that is enriched with organic material from living things. This combination—weathered mineral matter plus organic matter—creates soil, which supports plants and includes roots, air, and water pathways. So why soil is the best fit: it specifically refers to that in-place, weathered mineral material plus organic matter that has formed a living, interacting layer on the surface. Regolith covers all loose material above bedrock, including soil, rock fragments, dust, and debris, but isn’t defined by having organic material mixed in. Sediment is material deposited by wind, water, or ice and isn’t necessarily formed in place with organic matter. Bedrock is the solid rock beneath the loose materials, not the loose mixture itself. Soil best matches the idea of loose rock fragments and clay derived from weathered rock that’s mixed with organic material.

The concept here is the difference between surface materials formed by weathering and life processes. The description points to soil: a layer of loose mineral particles produced by weathering (rocks breaking down to fragments and clay) that is enriched with organic material from living things. This combination—weathered mineral matter plus organic matter—creates soil, which supports plants and includes roots, air, and water pathways.

So why soil is the best fit: it specifically refers to that in-place, weathered mineral material plus organic matter that has formed a living, interacting layer on the surface. Regolith covers all loose material above bedrock, including soil, rock fragments, dust, and debris, but isn’t defined by having organic material mixed in. Sediment is material deposited by wind, water, or ice and isn’t necessarily formed in place with organic matter. Bedrock is the solid rock beneath the loose materials, not the loose mixture itself.

Soil best matches the idea of loose rock fragments and clay derived from weathered rock that’s mixed with organic material.