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.
The Earthâs carbon reservoirs naturally act as both sources , adding carbon to the atmosphere, and sinks , removing carbon from the atmosphere. If all sources are equal to all sinks, the. carbon cycle can be said to be in equilibrium (or in balance) and there is no change in the size of. the pools over time.