Gravel is a collection of rock particles whose diameter may range from 2mm to 4mm. In general terms, gravel particles may be as large as pebbles. Gravel beds are generally the remains of ancient seashores or river beds. Gravel is used commercially in the making in the concrete. See conglomerate and sand.
Related category GEOLOGY AND PLANETARY SCIENCE
Home • About • Copyright © The Worlds of David Darling • Encyclopedia of Alternative Energy • Contact