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A characteristic feature of the biosphere is a mosaic of its structure.

Life, being organized on a global scale, functioning within the individual "quanta" of the biosphere. Extent of an ecosystem is very different. Their length on the ground, for example, varies from a few meters (sand dunes, small lakes in the tundra of saucers) to several kilometers (saline, homogeneous areas of the steppes, forests). Ecosystem on a global scale is the Earth's biosphere. Despite its relative isolation, ecosystems are closely linked. Besides there is plenty of evidence. The simplest: we consume oxygen all year round, and he stands by plants only during the growing season. In the rest of the time we spend the oxygen supplied by plants of the opposite hemisphere. There is more sad evidence of global integration Biosphere cycle: in the milk of European women radioactive strontium appeared regularly in four months after each test nuclear weapons in the Pacific Ocean.

The main elements involved in the Biosphere cycle, are hydrogen, oxygen, carbon, nitrogen, calcium, potassium, silicon, phosphorus, sulfur, strontium, barium, iron, manganese, zinc, molybdenum, copper and nickel. Cycles of chemical elements caused by the action of living matter, are called biogeochemical cycles. Their study is now being given much attention in connection with environmental issues.
There are some other substances involved in the biogeochemical cycles that are significantly lower than the rate of migration. Thus, the time required for the expansion of the entire mass of the photosynthetic water oceans, estimated 5-6 million years. Millions of years, measured as the duration of general planetary cycles of carbon, nitrogen and phosphorus.