Sore throat is a symptom, not a disease. In each case, there was a different cause that dictated a different treatment. The scratchy throat probably was a mechanical problem caused by dry, heated winter air and aggravated by my friend's tendency to breathe through her mouth when she sleeps.
Biogeochemistry includes the history of the great carbon reservoirs in the crust of the Earth, like limestone rocks and the coal deposits, as well as the distribution of nitrate and phosphate in the ocean.
1 However, carbon from this reservoir is exchanged extremely slowly with the carbon in the ocean and atmosphere. 2  Among this large reservoir there are also about 4000 GtC in the form of fossil fuels (oil, coal and natural gas).