Which rock is made of the smallest sediments?

A. Shale

B. conglomerate

C. Sandstone

D. Breccia

The correct answer is A. Shale.

Shale is a fined-grand classic sedimentary rock which is composed of mud.

Shale is typically exhibited varying degrees of fissility, breaking into thin layers. They are composed of the variable amount of clay quartz and mineral grains and a typical color which is grey.