Question

which describes the horizons in a soil profile? horizon a is mineral deficient. horizon o forms from organic material. horizon b undergoes the least amount of change. horizon c is most affected by the soil formation process.

Explanation:

• Horizon A: Rich in minerals and organic matter, not mineral - deficient.
• Horizon O: Composed of organic material like decomposed leaves and plants.
• Horizon B: Undergoes significant changes such as accumulation of minerals leached from above.
• Horizon C: Consists of weathered parent material and is less affected by soil - formation processes compared to A and B.

Answer:

Horizon O forms from organic material.