Sea wave polishing pebbles into rounded corners

Pebbles

A pebble is a clast of rock with a particle size of 4 to 64 millimeters based on the Krumbein phi scale of sedimentology. A rock made predominately of pebbles is termed a conglomerate. Image File history File linksMetadata Size of this preview: 800 × 531 pixelsFull resolution (2048 × 1360 pixel, file size: 1. ... Image File history File linksMetadata Size of this preview: 800 × 531 pixelsFull resolution (2048 × 1360 pixel, file size: 1. ... Image File history File linksMetadata Size of this preview: 800 × 470 pixelsFull resolution (1024 × 601 pixel, file size: 283 KB, MIME type: image/jpeg) Pebbles File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): Pebble Metadata This file contains... Image File history File linksMetadata Size of this preview: 800 × 470 pixelsFull resolution (1024 × 601 pixel, file size: 283 KB, MIME type: image/jpeg) Pebbles File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): Pebble Metadata This file contains... Pebble can refer to A small rock — see pebble A pagan representative organisation in the UK — see PEBBLE (pagan organisation) The Motorola PEBL U6, often referred to as the Pebl, a cell phone (mobile phone) from Motorola Pebble Beach, CA Pebbles Category: ... Clastic rocks refers to rocks formed from fragments of pre-existing rock. ... The rocky side of a mountain creek near Orosí, Costa Rica. ... Particle size, also called grain size, refers to the diameter of individual grains of sediment, or the lithified particles in clastic rocks. ... A millimetre (American spelling: millimeter), symbol mm is an SI unit of length that is equal to one thousandth of a metre. ... Sedimentology is the branch of geology primarily concerned with understanding the characteristics of sediments, sedimentary processes and sedimentary rocks originally deposited in sedimentary basins. ... A conglomerate with iron oxide cementing material Conglomerate, Submarine Landslide located at Point Reyes, Marin County California. ...

Pebble tools are among the earliest known man-made artifacts, dating from the Palaeolithic period of human history. They have been found at Olduvai Gorge (1.85 million years ago^{[citation needed]}) and at Longuopo in China (1.8 to 1.5 MYA^{[citation needed]}). This page discusses common devices known as tools, for other meanings see Tool (disambiguation) Modern hammer A tool is, among other things, a device that provides a mechanical or mental advantage in accomplishing a task. ... The Paleolithic or Palaeolithic – lit. ... Olduvai Gorge, February 2006 Olduvai Gorge from space Topography of Olduvai Gorge The Olduvai Gorge or Oldupai Gorge is commonly referred to as The Cradle of Mankind. ...

See also

• Gravel