Multiple choice

Select the correct order of size of rock particles found in the soil.

  1. sand < gravel < cobble

  2. gravel > cobble > sand

  3. sand > cobble > gravel

  4. cobble > sand > gravel
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Rock particle sizes increase as follows: sand (0.0625-2mm) < gravel (2-64mm) < cobble (64-256mm). Option A correctly shows this ascending order. The other options either reverse the order or place cobble incorrectly. Understanding this gradation is fundamental to soil texture classification.

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