14th EditionEdward J. Tarbuck
1st EditionLutgens, Tarbuck
1st EditionArthur T. DeGaetano, Jay M. Pasachoff, Mead A. Allison
EARTH SCIENCE Chemical cycles can be modeled using system models. For each part of the model (a through g), list the best example (1 through 8). a. process, b. control, c. net movement, d. reservoir, e. positive feedback, f. negative feedback, g. component of matter, h. component of energy. 1. sunlight. 2. nitrogen. 3. About 800 Gt of carbon are in the atmosphere. 4. The acidity of water affects the cycling of nitrogen. 5. During nitrogen fixation, microbes convert nitrogen from the atmosphere into forms of nitrogen that can be used by plants. 6. As global temperatures rise, permafrost melts, releasing carbon dioxide and methane into the atmosphere, which causes temperatures to rise. 7. 0.2 Gt of carbon enter the geosphere each year, while 9.2 Gt leave the geosphere, resulting in a total decrease of 9 Gt of carbon from the geosphere each year. 8. As carbon dioxide levels rise, more plants grow, causing carbon dioxide levels to drop, causing fewer plants to grow.