Gravel The name given to rounded, water-worn stones produced by rock attrition by moving water.River gravels generally form in the upper reaches and in the middle of the stream. Both kinds consist of hard types of stone, flint, granite and […]
Gravel The name given to rounded, water-worn stones produced by rock attrition by moving water.River gravels generally form in the upper reaches and in the middle of the stream. Both kinds consist of hard types of stone, flint, granite and […]