Question

What is not true about silts?

(a) They are coarser than sand

(b) They are finer than sand

(c) They are further divided into fine, medium and fine silts

(d) They are major constituents of shale

This question was addressed to me by my college professor while I was bunking the class.

My question comes from Classification of Sedimentary Rocks topic in section The Study of Rocks of Engineering Geology

Answer 1

Correct answer is (a) They are coarser than sand

The explanation is: Silts are very fine-sized particles of varying composition lying in the range 1/16 mm and 1/256 mm. they are further divided into three categories, fine, medium and coarse. The silts are the major constituents of rocks known as shales.