Rockdust

$A coal miner in West Virginia spraying rockdust to reduce the combustible fraction of coal dust in the air of a bituminous coal mine.$

Rock dust, also known as rock powders, rock minerals, rock flour, soil remineralization, and mineral fines, consists of finely crushed rock, processed by natural or mechanical means, containing minerals and trace elements widely used in organic farming practices.

单词	Rock dusting
释义	Rock dusting 英语百科 Rockdust $A coal miner in West Virginia spraying rockdust to reduce the combustible fraction of coal dust in the air of a bituminous coal mine.$ Rock dust, also known as rock powders, rock minerals, rock flour, soil remineralization, and mineral fines, consists of finely crushed rock, processed by natural or mechanical means, containing minerals and trace elements widely used in organic farming practices.
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Rock dusting

Rockdust