Gravel is a loose aggregation of rock fragments. Gravel is classified by particle size range and includes size classes from granule- to boulder-sized fragments. In the Udden-Wentworth scale gravel is categorized into granular gravel (2 to 4 mm or 0.079 to 0.157 in) and pebble gravel (4 to 64 mm or 0.2 to 2.5 in). ISO 14688 grades gravels as fine, medium, and coarse with ranges 2 mm to 6.3 mm to 20 mm to 63 mm. One cubic metre of gravel typically weighs about 1,800 kg (or a cubic yard weighs about 3,000 pounds). Gravel is an important commercial product, with a number of applications. Many roadways are surfaced with gravel, especially in rural areas where there is little traffic. Globally, far more roads are surfaced with gravel than with concrete or tarmac; Russia alone has over 400,000 km (250,000 mi) of gravel roads. Both sand and small gravel are also important for the manufacture of concrete.
lovely animals - lovable animals kitten in stone
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lovely animals

Added 3 weeks ago by Basiunia


as real - kitten like a real one made of stones
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as real

Added year ago by Halina


kolorowe kamienie - można układać tym razem stopy
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kolorowe kamienie

Added over a year ago by Halinka


klomb w ogrodzie - dróżka zrobiona z małych kamieni
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klomb w ogrodzie

Added over a year ago by Marianna- Krystyna


Skład drewna do kominka - Skład drewna do kominka
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Skład drewna do kominka

Added over a year ago by Rysiek