Science Grade 2-3

Soil Types: Sand, Clay, Humus, and Water Holding

Compare sand, clay, and humus by how they feel and hold water

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Compare sand, clay, and humus by how they feel and hold water

Science - Grade 2-3

Instructions: Read each problem carefully. Write your answers in complete sentences when you can. Show your thinking in the space provided.
  1. 1
    Water drains through loose sand grains.

    Sand has large, loose grains. What do you think happens when water is poured on sand?

  2. 2
    Water moves slowly through tightly packed clay.

    Clay has very tiny pieces packed close together. Does clay let water drain quickly or slowly? Explain your answer.

  3. 3
    A healthy plant grows in dark crumbly humus.

    Humus is made from dead plants and animals that have broken down. Why is humus helpful for plants?

  4. 4
    A hand feels gritty sand.

    Circle the soil type that feels gritty: sand, clay, or humus. Then write one sentence about it.

  5. 5
    Wet clay sticks to fingers.

    Circle the soil type that often feels sticky when wet: sand, clay, or humus. Then explain why.

  6. 6
    Different soils drain water at different speeds.

    A student pours the same amount of water into three cups: one with sand, one with clay, and one with humus. Which cup will probably drain the fastest?

  7. 7
    A healthy plant grows in mixed soil with humus.

    A plant needs soil that holds some water but does not stay too soggy. Which soil type might be best when mixed with other soils: sand, clay, or humus?

  8. 8
    Sand, humus, and clay columns show different drainage rates.

    Put these soils in order from water draining fastest to slowest: clay, sand, humus.

  9. 9
    Dark crumbly soil contains old leaf pieces.

    Look at a soil sample that is dark, crumbly, and has tiny pieces of old leaves in it. What soil material is probably in the sample?

  10. 10
    A puddle sits on tightly packed clay soil.

    A gardener says, 'This soil is mostly clay, so puddles stay on top after it rains.' Why might puddles stay on clay soil?

  11. 11
    Water moves through large spaces between soil particles.

    Fill in the blank: Soil with bigger spaces between particles usually lets water move through it __________.

  12. 12
    A plant in humus-rich soil has more water than a plant in dry sand.

    Two plants get the same amount of sunlight. Plant A is in dry sand. Plant B is in soil with humus mixed in. Which plant may have more water available? Explain.

  13. 13
    Sand is loose and grainy while clay is smooth and packed.

    Write one way sand and clay are different.

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