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6th grade science unit 3 Earth's Comp and Changes posttest 25-26 DUE: Dec 19 — 24 Questions
Armstrong, Kennedee

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Soil profile
Read the passage and answer the following question(s).

Soil profile

Soil is made up of a mixture of stones, sand, mud, clay, and decomposed organic material. A soil profile is a vertical section of soil that shows distinct soil layers. In an experiment to study the soil profile, a student adds a handful of soil into a glass jar containing water. Then, the student stirs the soil-water mixture using a glass rod and allows the mixture to settle down for two hours until the water is clear at the top. The student observes that the soil settles in different layers depending on the weight and size of the soil particles as shown.



Resize Columns
Question 23.



Which layer contains organic material in the soil profile?


gravel


stone


humus


clay

Question 24.



Why did the stones settle to form the bottom layer of the soil profile?


They are the lightest particles.


They have a definite shape.


They have similar colors.


They are the heaviest particles.



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All Answers 1

Answered by GPT-5 mini AI
Q23: humus — humus is the layer containing decomposed organic material.

Q24: They are the heaviest particles — heavier (larger) particles settle to the bottom first.