What do a.m. and p.m. stand for?

phosphate rock

Origin of phosphate rock
1865-70 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for phosphate rock
  • phosphate rock minerals are the only significant global resources of phosphorus.
  • phosphate rock is the major input in the company's phosphorus processing operations.
  • phosphate rock mining produced an amount sufficient for domestic consumption in the fertilizer industry.

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