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Soil Horizons

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Soil Horizons Answer Key

Bedrock can be found in the A horizon.
  1. True
  2. False
The B horizon is called the topsoil.
  1. True
  2. False
The A horizon is made up of minerals and humus which contain nutrients that feed plants.
  1. True
  2. False
Most plant roots grow in the C horizon.
  1. True
  2. False
                is the loose covering of weathered rock particles and decaying organic matter overlying the bedrock of Earth's surface.
  1. Humus
  2. Compost
  3. Sediment
  4. Soil
The five factors that determine how soils develop are
  1. parent material, climate, vegetation, landscape, and time.
  2. animals, humus, weather, leaching, and volcanoes.
  3. sunlight, animals, humus, leaching, and earthquakes.
In which horizon of a soil profile is the parent material usually found?
  1. D
  2. B
  3. C
  4. A
In which horizon of a soil profile does leaching normally occur?
  1. Horizon A
  2. Horizon D
  3. Horizon B
  4. Horizon C
What is the C horizon?
  • It is the coarse material broken down from the underlying bedrock.
Describe the major characteristics of the R soil horizon.
  • mainly hard rock/bedrock, found at the bottom of the soil layers
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