Density of Pebbles = 6.90 g/Cm^3
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Pebbles form from larger rocks that have eroded into smaller rocks thus producing pebbles.
26928 pebbles for the minimum depth.
Well, darling, if you want to separate marbles and pebbles, you can simply use a sieve or mesh screen with holes big enough for the pebbles to pass through but small enough to catch those sassy marbles. Just give it a good shake and watch those marbles roll into one pile and the pebbles into another. Easy peasy lemon squeezy!
weathering
They were small stones or pebbles - called calculus (pl = calculi).