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Gravels :
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is a sedimentary rock,which composed of quartz sand grains ,with binding agents or composed of silica , others such as granite , limestone and flew by water power to the river or sea, there are many shapes and colours depending on origin.
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Thai Gravels :
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Thai gravels are a few colours such as white ,yellow , brown, .They can be applied in various designs garden feature.
Source : River , Sea
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