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.
Rainforests are one of the world's primary carbon reservoirs. By absorbing carbon dioxide from the air, storing the carbon and giving us oxygen to breathe, tropical forests act as the Earth's thermostat, regulating temperatures and weather patterns.