Which describe the horizons in a soil profile? Check all that apply.

Horizon A is mineral deficient.

Bedrock lies below the soil layers.

Horizon O forms from organic material.

Horizon B undergoes the least amount of change.

Horizon C is least affected by the soil formation process.

Bedrock lies below the soil layers.

Horizon O forms from organic material.

Horizon C is least affected by the soil formation process.

These are the correct answers.

Answer: correct options are Bedrock lies below the soil layers, Horizon O forms from organic material and Horizon C is least affected by the soil formation process.

Soil profile is a vertical section of the soil that is exposed by digging a hole from the surface of the soil to the underlying bedrock. Most soil profiles are composed of a series of horizons or layers of soil.

O horizon - fallen leaves and partially decomposed organic matter

A horizon - A surface mineral horizon, living organisms, and rock particles.

B horizon - A sub-surface horizon where depletion of organic matter and an accumulation of clay.

C horizon - A layer of partially altered bedrock

R horizon - Hard bedrock