Multiple choice

In which layer of soil does the maximum of Earth's biological soil activity occur?

  1. Limnic

  2. Bedrock

  3. Parent rock

  4. Subsoil

  5. Topsoil
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Topsoil is the upper, outermost layer of soil, usually the top 2 inches (5.1 cm) to 8 inches (20 cm). It has the highest concentration of organic matter and microorganisms and is where most of the Earth's biological soil activity occurs.

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