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.
Natural carbon sources are nearly balanced by natural carbon sinks. The life processes of vegetation, animals, and microbes release around Ã¢ 55 billion tons of carbon in the form of carbon dioxide into the atmosphere per year. The ocean releases an additional 90 billion tons.