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Free Practice Quiz Question List

1 Soil Formation and Soil-Forming Factors Online Quiz Questions

Use this free practice quiz with 20 questions to review 1 Soil Formation and Soil-Forming Factors, test your knowledge, and prepare for your next test or exam.

20 questions
01
Fill in the blank
1 point

Water and sediment may collect in lower, flatter areas, where soils can become .

02
Fill in the blank
1 point

Physical weathering can break rock into smaller pieces without changing its .

03
Written response
1 point

What scientific term names the process by which soil develops?

04
True or false
1 point

True or false: Leaching can move dissolved substances downward through soil.

  1. A

    True

  2. B

    False

05
True or false
1 point

True or false: Soil that has been developing for a longer time is necessarily more fertile than younger soil.

  1. A

    True

  2. B

    False

06
Choose one
1 point

Two sites have the same bedrock, similar vegetation and topography, and have been stable for the same length of time. Their climates differ. Which soil-forming factor most directly explains why their soils may develop differently?

  1. A

    Parent material

  2. B

    Climate

  3. C

    Topography

  4. D

    Time

07
Choose one
1 point

A soil is relatively thin on a steep hillside. Which explanation best connects the landform to this observation?

  1. A

    Runoff and erosion commonly remove soil from steep slopes.

  2. B

    Steep slopes always receive more deposited sediment than flat areas.

  3. C

    Soil horizons form more quickly on steep slopes because soil is continually removed.

  4. D

    Slope has no effect on soil thickness.

08
Choose one
1 point

A region is warm and moist for much of the year. What effect on soil formation is generally expected?

  1. A

    They generally slow chemical weathering and biological activity.

  2. B

    They generally promote chemical weathering and biological activity.

  3. C

    They prevent water from moving through soil.

  4. D

    They determine the soil’s parent material.

09
Choose all
1 point

Which processes are examples of chemical weathering? Select all that apply.

  1. A

    Acids react with minerals and dissolve some of them.

  2. B

    Water freezes in a crack and breaks rock into smaller pieces.

  3. C

    Oxygen reacts with minerals and changes them.

  4. D

    Roots widen an existing crack as they grow.

10
Choose all
1 point

Which are ways organisms can directly affect soil? Select all that apply.

  1. A

    Roots open pathways and help bind soil particles.

  2. B

    Earthworms mix soil and create pores.

  3. C

    Mineral composition determines the direction of sunlight.

  4. D

    Decomposers break down organic residues.

11
Choose one
1 point

Which example is physical weathering?

  1. A

    Oxygen reacts with minerals and forms new substances.

  2. B

    Water freezes in a crack and widens it.

  3. C

    Microbes release compounds that alter minerals.

  4. D

    Acid dissolves minerals and carries them away.

12
Choose one
1 point

A young soil develops from coarse, mineral-rich river sediment. Which property is most directly influenced by this parent material?

  1. A

    It determines how long the soil will remain stable.

  2. B

    It controls the direction a slope faces.

  3. C

    Its mineral composition and particle sizes influence soil texture and drainage.

  4. D

    It determines which organisms will decompose all organic matter.

13
Choose one
1 point

Earthworms and burrowing animals are active in a soil. Which change would their activity most directly contribute to?

  1. A

    They mix soil and create pores.

  2. B

    They make steep slopes lose less soil.

  3. C

    They determine the mineral composition of bedrock.

  4. D

    They stop water from moving through soil.

14
Choose one
1 point

In a warm, rainy climate, water dissolves substances near the soil surface and carries them downward. What process is occurring?

  1. A

    Decomposition

  2. B

    Deposition

  3. C

    Physical weathering

  4. D

    Leaching

15
True or false
1 point

True or false: A soil that has developed for a longer time is necessarily more fertile than a younger soil.

  1. A

    True

  2. B

    False

16
Written response
1 point

What is the process called when water carries dissolved substances or fine particles downward through soil?

17
Written response
1 point

What is the technical term for the development of soil?

18
Choose one
1 point

Two nearby sites have similar parent material and climate. One is a steep slope and the other is a lower, flatter area. Which comparison is most likely?

  1. A

    The steep slope is likely to have deeper soil because runoff adds sediment; the flatter area is likely to lose soil.

  2. B

    The steep slope is likely to have thinner soil from erosion; the flatter area may collect sediment and develop deeper soil.

  3. C

    Both sites must develop equally deep soil because they have the same parent material.

  4. D

    The flatter area must have thinner soil because water cannot collect there.

19
Written response
1 point

Two nearby slopes receive different amounts of sunlight and consequently differ in warmth and moisture. What land characteristic can help explain this difference? Enter the exact two-word term.

20
Open ended
1 point

A site has existed for a long time, but its soil layers are not very distinct. Explain why the site’s age alone does not guarantee distinct soil horizons, and identify two factors that could alter or interrupt horizon development.