Boulder Cobble Gravel Pebble Sand Mud Clay

List in order from smallest to largest the grain sizes used to describe detrital rocks.Sand, pea, acorn, walnut, apple, grapefruit, watermelon, boulder.0 0 10.Login to reply the answers post silverhorn.Lv 6.1 decade ago.Clay, silt, sand fine, medium, coarse, gravel pebble, cobble, boulder.Sources sedimentary geology.0 9 0.