Multiple choice

Which of the following type of rocks has the smallest size particles?

  1. Clay

  2. Silt

  3. Sand

  4. Gravel

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Clay particles are the finest among soil particle sizes, typically less than 0.002mm in diameter. Silt particles are larger (0.002-0.05mm), sand even larger (0.05-2mm), and gravel is the coarsest (>2mm). The smaller the particle size, the greater the surface area and water-holding capacity.