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 horizons are designated O (organic), A (topsoil), E (eluviated), B (subsoil), C (parent material), and R (bedrock). The R-horizon consists of unweathered bedrock that underlies all other soil layers. It is not soil but consolidated rock.

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