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B
Phosphorus
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C
Magnesium
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D
Sulphur
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Solution
The correct option is B Phosphorus There are 4 layers of Earth, namely lithosphere (land), hydrosphere (water), biosphere (living), and atmosphere (air). Lithosphere of Earth makes up the hard and rigid outer layer of the Earth. It is reservoir of phosphorus. The largest reservoir of phosphorus is sediments or sedimentary rocks. Crystalline rocks are sedimentary rocks. They are the natural source of phosphorous.