small white pebbles for garden |
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| navigate by keyword : rock soil stonewall asphalt flooring gravel pebble cobblestone rubble sand floor boulder monochrome geology wall wood brick small white pebbles garden clast particle size based udden wentworth scale sedimentology generally considered larger granules 079 157 diameter smaller cobbles 256 termed conglomerate tools earliest man made artifacts dating palaeolithic period human history |
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| A pebble is a clast of rock with a particle size of 4â64 mm (0.16â2.52 in) based on the Udden-Wentworth scale of sedimentology. Pebbles are generally considered larger than granules (2â4 mm (0.079â0.157 in) in diameter) and smaller than cobbles (64â256 mm (2.5â10.1 in) in 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. |
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