Multiple choice

Which horizon of soil is called bed rock?

  1. O - horizon

  2. A - horizon

  3. B - horizon

  4. R - horizon
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Soil is divided into horizontal layers called horizons, including O, A, B and C horizons above the bedrock. The R-horizon represents the underlying bedrock from which soil is formed through weathering processes. It consists of unweathered parent rock material and lies below all soil horizons.

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