By Peter Warneck (auth.), C. N. Hewitt, W. T. Sturges (eds.)
This publication examines the ways that human task is affecting the composition of the worldwide surroundings, how either the importance and premiums of switch examine with common cycles, and what results those alterations could have at the worldwide weather, ecosystems, and the wellbeing and fitness of human existence in the world.
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21-7. 6. Wetherill, G. , Accumulation of the terrestrial planets. In Protostars and Planets, ed. J. Gehrels. University of Arizona Press, Tucson, AZ, 1978, pp. 565-98. 7. Alfven, H. , Evolution of the Solar System, NASA SP-345, US Government Pnnting Office, Washington, DC, 1976. 8. Weidenschilling, S. , Accretion of the terrestrial planets, II. Icarus, 27 (1976) 161-70. 9. Greenberg, R. , Wacker, J. , Hartmann, W. K. & Chapman, C. , Planetesimals to planets: numerical simulation of collisional evolution.
An additional geochemical cycle of nitrogen occurs with the turnover of the sediments. 7x 103a _ Ib 9x108c a nitrogen fixation rate of 210 Tg N/annum. bTurnover time for photosynthetic active parts, growth, shedding and decay of leaves. cBased on the turnover rate of 30 Tg C/annum for organic carbon in the sediments and a ratio N/C = 0·075. aFor CHEMICAL CHANGES ON GEOLOGICAL AND RECENT TIME SCALES 29 However, both cycles are relatively unimportant compared with that between the atmosphere and biosphere, and the marine and terrestrial environments.
50 PETER WARNECK 40. Chameides, W. L. & Walker, J. C. , Rates of fixation by lightning of carbon and nitrogen in possible primitive atmosphere. Origins of Life, 11 (1981) 291-302. 41. Kasting, 1. , Stability of ammonia in the primitive terrestrial atmosphere. 1. Geophys.