Pebble
A pebble is a piece of rock with a particle size of 4 to 64 millimetres. They are often made of flint.
Pebbles are larger than granules (2 to 4 millimetres diameter) and smaller than cobbles (64 to 256 millimetres diameter). A rock made predominantly of pebbles is termed a conglomerate. Pebble tools are among the earliest known man-made artifacts, dating from the Palaeolithic period of human history.
A beach composed chiefly of surface pebbles is commonly termed a shingle beach. This type of beach resists wave erosion, and has ecological niches which can provide habitat for animals and plants.
Pebble Media
- Pebble Dash (15366562092).jpg
Close view of pebbles[clarification needed]
- Beach rocks and pebbles.jpg
Differently sized rocks and pebbles on a beach in northern England
- River side pebbles and rocks.jpg
The beauty of nature
- Pebble lane.JPG
A walkway decorated with pebbles set into concrete
- Wave Retreating from Pebbles.jpg
Pebbles given a rounded shape by wave action