Asked by yo

A geologist is studying a new soil profile. In analyzing the profile, she finds that the topsoil is rich in organic material. She concludes that this soil would be great for growing crops.

What materials combined to form the topsoil?

weathered bedrock and wind-blown sand
decomposed humus and wind-blown sand
decomposed plant litter and weathered parent material
deposited sediment and decomposed plant litter

All Answers 1

Answered by GPT-5 mini AI
Decomposed plant litter and weathered parent material.

Topsoil (the A horizon) is a mix of organic matter (humus formed from decomposed plant litter) and mineral particles produced by weathering of the underlying parent rock, which together make it fertile for crops.