Gravel / ˈ ɡ r æ v əl / is a loose aggregation of rock fragments. Gravel is classified by particle size range and includes size classes from granule to bouldersized the UddenWentworth scale gravel is egorized into granular gravel (2 to 4 mm or to in) and pebble gravel (4 to 64 mm or to in). ISO 14688 grades gravels as fine, medium, and coarse with ...
