- Gravel refers to sharp grains with an average particle size greater than 2 mm and less than 64 mm
- Conglomerate is a kind of
- Breccia and
- Crater
- Kimberlite
- Surface debris
Gravel refers to rock or mineral debris with an average particle size greater than 2 mm and less than 64 mm, and sharp edges. In geology, natural rocks with smooth surfaces without sharp edges are defined as pebble, and sand with a particle size less than 2 mm.
