Multiple choice

Which of the following is the most fertile layer of soil?

  1. Top soil

  2. Subsoil

  3. Bedrock

  4. Parent rock
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Topsoil (A-horizon) is the most fertile layer because it contains the highest concentration of organic matter, nutrients, and biological activity. Subsoil (B-horizon) has less organic material, while bedrock (C) and parent rock (D) are unweathered mineral layers with essentially no fertility. The topsoil is where plant growth primarily occurs and where most soil management practices focus.

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