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Fourth Grade (Grade 4) Soil Questions

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Grade 4 Soil
Which of the following is a soil layer?
  1. horizon
  2. topsoil
  3. subsoil
  4. All of the above
Grade 4 Soil
Why is soil so important to us?
  1. We build on it.
  2. We walk on it.
  3. Plants need it to grow.
  4. All of the above
Grade 4 Soil
How do plants help form soil?
  1. Plants break up rocks by spreading roots into cracks.
  2. Plant stems surround the rocks until they break.
  3. Plant leaves protect the rocks from extreme temperatures.
  4. Plants do not help form soil.
Grade 4 Soil
The soil layer that is affected most by erosion is                .
  1. topsoil
  2. subsoil
  3. bedrock
  4. parent rock
Grade 4 Soil
Christie is studying different types of soil. She is comparing clay, sand, gravel and silt. What soil type will she find the smallest particles?
  1. Loam
  2. Silt
  3. Clay
  4. Gravel
Grade 4 Soil
Tree roots reach down into the middle layer of soil, breaking up the rocks there. This soil layer is called                .
  1. bedrock
  2. topsoil
  3. subsoil
  4. parent rock
Grade 4 Soil
Which of these soil parts has the largest particles?
  1. silt
  2. clay
  3. humus
  4. sand
Grade 4 Soil
The minerals from rocks give soils their color.
  1. True
  2. False
Grade 4 Soil
The soil at the top of a hill has a lot of the smallest type of soil particle. The soil is made up mostly of                .
  1. bedrock
  2. sand
  3. humus
  4. clay
Grade 4 Soil
                is an ingredient of soil that is made of dead plants and animals.
  1. Rock
  2. Sand
  3. Humus
  4. Dirt
Grade 4 Soil
Which of the following is NOT true about soil?
  1. Farmers use soil to grow plants.
  2. Soil is an important natural resource.
  3. Soil contains pore spaces that can be filled with air or water.
  4. Soil is formed in a single layer.
Grade 4 Soil
A mixture of humus and different sized earth materials is                .
  1. a boulder
  2. a mineral
  3. soil
Grade 4 Soil
Some plants need more water to be able to grow. Juniper trees thrive in a dry condition. They do not need much water to be able to grow. Which type of soil would be the best for a Juniper tree?
  1. Clay
  2. Humus clay mix
  3. Sandy soil
  4. Silt
Grade 4 Soil
You might not see them, but soil is made up of water, air and living things as well.
  1. True
  2. False
Grade 4 Soil
Which layer of soil contains the most dead plant and animal materials?
  1. bedrock
  2. subsoil
  3. parent rock
  4. topsoil
Grade 4 Soil
Cotton, which is grown to make clothing, depends mostly on                 to grow.
  1. topsoil
  2. subsoil
  3. bedrock
  4. parent rock
Grade 4 Soil
                becomes richer as dead plants decay.
  1. Topsoil
  2. Subsoil
  3. Bedrock
  4. Parent rock
Grade 4 Soil
What are the 3 main layers of soil?
Grade 4 Soil
How do plants and animals help form soil?
Grade 4 Soil
What is subsoil?
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