By Samuel S. Butcher
Describes the transformation/movement of chemicals in a world context and is designed for classes facing a few facets of biogeochemical cycles. prepared in 3 sections, it covers earth sciences, aspect cycles and a synthesis of latest environmental matters.
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Additional resources for Global Biogeochemical Cycles
If this volatile was carried by the same material that brought water and carbon, then all three could not have been derived from a common comet source. 4 Accretion of the Planets Condensed solids, along with possible presolar solids, accumulated by the process of accretion to form planetary bodies. In the beginning, gravitational collapse may have been involved but most of the accretionary phase involved various forms of mechanical collision and sticking. The process started with low-velocity collisions of micrometer size dust and terminated with bodies as large as the Earth and Mars colliding with velocities of over 5 kmls.
Adapted from Wood (1979) with the permission of Prentice-Hall, Inc. Ti in all but the most primitive meteorites is most likely due to the loss of an early condensate that was composed of these elements. An early condensate of Ca, AI, Ti, and other highly refractory elements could have been separated by accretion from the region of the nebula where grains condensing later formed the AI-depleted chondrites. The Fe/Si fractionation may be the result of the different accretion efficiencies of metal and silicate grains, but even this is affected by condensation temperature, because it determines how Fe is divided between metal, sulfide, oxide, and silicate phases.
Orians scientific views of when and how life might have originated and evolved are based upon studies of the fossil record in combination with appropriate dating procedures and imaginative chemical experiments in the laboratory. It is not surprising that early students of life tended to think of its origins in terms of processes operating on familiar time-scales. At that time, the great age of the Earth was not appreciated, nor were methods available for dating ancient events. Today, suitable methods exist for determining the age of materials that are billions of years old.
Global Biogeochemical Cycles by Samuel S. Butcher