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The scale of geological disasters that occurred in Earth's history.Worst of the known earthquakes accompanied by the release amplitude of 4-6 m. Innumerable disasters are and volcanic eruptions. The largest of these occurred early in this century in Alaska. The height of the cliff formed by frozen lava, here reaches 100 meters! And during the eruption on the island of Krakatoa in 1883, fell to ash layer thickness from 2 m to 60 m. But we must not forget that at the end of the Mesozoic place enormous outpouring of basalt. Not be ruled out that they resulted in a dramatic accumulation of iridium in the atmosphere first, and then - and to its concentration in a limited traced clearly. By the way, spacers with iridium are present everywhere: for example, studied in detail eign Cretaceous and Paleogene sediments in the Crimea and its not found. Thus, all the material accumulated by the geology, shows the continuity of the organic world of the Earth throughout geological history and correct conclusion about the absence of nitrogen in the crust (formed in the absence of life) deposits. Internal diversity of the biosphere has provided its resistance even to the most significant catastrophic shocks. She - this stability - defined by exceptional diversity of living organisms and the biosphere is almost infinitely more of them, interchangeable components of its ecosystem, duplication of individual links of biogeochemical cycles, stability of life and activity of individuals. |
Common Facts:Perhaps, we could not, until recently, to appreciate this diversity - we just have nothing to compare it to our biosphere. And only now, when we saw on television, in the pages of illustrated editions of other planets, landscapes, devoid of life - only now we can fully appreciate the "inner diversity" of the biosphere. It serves as a guarantee of the survival of life on our planet. |