alleryStart learning →Which soil particles are smaller than 0.002 mm in diameter?
ASand grains
BSilt grains
CClay particles
DHumus particles
Answer & Solution
Correct answer: C. Clay particles
1. Particle size classes run from sand down through silt to the finest fraction.
2. Silt covers particles between 0.002 and 0.1 mm.
3. Particles smaller than 0.002 mm in diameter are clay.
4. Humus is organic material and is classified by origin rather than by particle diameter.
5. A soil that mixes sand, silt and humus with no dominant particle size is a loam.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 31 "Soil and Plant Nutrition", section 31.2 The Soil_
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