MAST382 Lecture Notes - Lecture 3: After Earth
6 Sep 2016
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Document Summary
Influence the information and modification of the land and seafloor. Control many features of our physical environment. Enables essential chemicals to transported to and within living organisms. After earth cooled, crust solidified and water vapor in atmosphere condensed into liquid water. Since earth"s eater first condensed temp of atmosphere changed relatively little. Total amount of water at earth"s surface probably has remained relatively constant over many millions of years. During the first 100,000,000 years of the planet 10^23 to 10^26 g of et material impacted the surface of our planet. If just 10% of these impacts were comets it would account for all the oceanic water present today. However recent data shows that the h/d makeup of cometary water is dif from that in the oceans. Sources and sinks of chemicals dissolved in seawater. Concentrations of all substances have reached an approximate steady state. If input and concentrations are constant then output = input.
