| 1. | There are important deposits of phosphate rock in a number of areas.
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| 2. | In 2015, the US produced 12 percent of the world's phosphate rock.
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| 3. | Lichens are phosphate rocks in the sedimentary, fossil-rich Doushantuo Formation in China.
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| 4. | The phosphate rock is found Eocene deposits at the coastal basin.
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| 5. | US production of phosphate rock peaked in 1980 at 54.4 million metric tons.
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| 6. | Producers of phosphorus-containing fertilizers now select phosphate rock based on the cadmium content.
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| 7. | Most phosphate rocks can be used for phosphate rich organic manure.
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| 8. | Opened in 1976 to serve a large deposit of phosphate rock for fertiliser.
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| 9. | The predominant source of phosphorus is phosphate rock and in the past guano.
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| 10. | This issue is particular with the phosphate by-product, since phosphate rocks naturally contain actinides.
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