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Gravel /ËÉ¡raevÉl/ ËÉ¡rÃ¦vÉl is composed of unconsolidated rock fragments that have a general particle size range and include size classes from-granule to-boulder sized. Fragments gravel is categorized by The-Udden wentworth scale into granular (gravel 2 to 4 mm or.0 079 to.0 157) in and pebble (gravel 4 to 64 mm or.0 2 to.2 5). in Pay gravel: also known as pay dirt; a nickname for gravel with a high concentration of gold and other precious metals. 2  The metals are recovered through gold panning.
Gravel has a specific meaning in both Civil Engineering and Geology. In both cases it is related to the diameter of the grains which the soil is composed of.The density of gravel varies depending on many many things. For one there is packed and loose density. Next the density varies much of how many fines and coarses (sand and â¦ rock) are in the gravel mixture. There are many ways to find the density of gravel but takes a little know how.