Origin of Life: Evolution can explain formation of many species ultimately from a single species in the past. But origin of life (first species) needs further explanation. Oparin and Haldane proposed biochemical theory of evolution : Chemical evolution : Formation of simple organic substances (amino acids, glucose, nucleotides) from inorganic substances CH4, NH3, H2S on primitive Earth. Biological/ Organic Evolution : Formation of first primitive cell using organic molecules. Evolution of different forms of life forms from simple unicellular prokaryotic organism Miller and Urey experiment : They simulated primitive earth. Primitive reducing atmosphere Gases like H2S, NH3, CH4 Evaporation from hot oceans Boiling water in flask Lightening ...
The ozone hole results from ozone-depleting chemicals (e.g. chlorofluorocarbons (CFCs)). When CFCs are hit by ultraviolet light, they release chlorine. Chlorine reacts with ozone, destroying it to produce chlorine monoxide and diatomic oxygen.
ReplyDeleteThese reactions are most effective when they occur on the surface of ice crystals, in the stratosphere. There are more ice crystals when it is most cold.
Antarctica is colder than the Arctic circle because the ratio of land to water is higher.
Therefore ozone depletion over the South Pole is greater than ozone depletion over the North Pole.
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