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Eighth Grade (Grade 8) Soil Questions

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Grade 8 Soil
The measure of the ability of a soil to support plant growth is
  1. temperature.
  2. color.
  3. fertility.
  4. consistency.
Grade 8 Soil
The solid layer of rock beneath the soil is called
  1. bottom rock
  2. solid rock
  3. top rock
  4. bedrock
Grade 8 Soil
Which lists the soil particles from largest to smallest?
  1. sand, gravel, clay, silt
  2. gravel, silt, sand, clay
  3. gravel, sand, silt, clay
  4. gravel, clay, sand, silt
Grade 8 Soil
How is soil made?
  1. weathering
  2. infiltration
  3. transpiration
  4. erosion
Grade 8 Soil
Which of the following statements about soil is most true?
  1. The deeper into the soil layers, the more rock appears.
  2. The deeper into the soil layers, the more organic matter.
  3. The more shallow the layer, the greater amount of rock appears.
  4. The deeper the soil layer, the more nutrients.
Grade 8 Soil
Which of the following makes A-Horizon ideal for growing plants?
  1. carbonic acid
  2. humus
  3. organic matter
  4. rocks
Grade 8 Soil
Soil is a mixture of
  1. decayed organic matter and oxygen
  2. weathered rock and water
  3. mineral fragments
  4. all answers are correct
Grade 8 Soil
Which is the correct order of soil horizons from top to bottom?
  1. A, B, C, O
  2. O, A, B, C
  3. O, C, B, A
  4. C, B, A, O
Grade 8 Soil
A soil's texture is determined by its
  1. water content
  2. mineral composition
  3. thickness
  4. particle sizes
Grade 8 Soil
The layer of parent material in soil is called the:
  1. O-Horizon
  2. A-Horizon
  3. B-Horizon
  4. C-Horizon
Grade 8 Soil
Organic matter in soil is also called
  1. regolith
  2. humus
  3. talus
  4. loam
Grade 8 Soil
What is an organic matter in soil?
  1. leaching
  2. horizon
  3. humus
  4. profile
Grade 8 Soil
What property is the amount of water in soil defined as?
  1. soil moisture
  2. soil color
  3. infiltration
  4. temperature
Grade 8 Soil
Humus is formed as a result of
  1. decomposition
  2. exfoliation
  3. oxidation
  4. weathering
Grade 8 Soil
How does soil erosion affect topsoil?
  1. It washes it away
  2. It keeps it moist
  3. It makes it more fertile
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