Definition, divisions, history and position of the geochemistry in natural sciences. Fundamentals of geochemical systems, geochemical variables, termodynamics and kinetics. Chemical elements, atomic quantum model, origin of elements. Fundamentals of cosmology, origin, age and composition of the Universe. Genesis, structure and composition of planets and other bodies of the Solar system. Origin of elements, theory of nucleosyntesis. The Earth megasystem, definition of geosphere, theory of Earth structure. Structure and composition of the Earth crust. Average element composition of the Earth crust. Structure and composition of the Earth mantle. Structure and composition of the Earth core. Composition of the Earth as entity. Geochemical system of the atmosphere, structure and composition of the atmosphere. The origin of variable constituents of the atmosphere, origin and evolution of the atmosphere, losses
and additions to the atmoshere. Geochemical system of the hydrosphere, Hydrologic cycle. The compotion of the atmosphere. Geochemical system of oceans; Conservative and nonconservative elements in oceans. Geochemical system of the biosphere. The composition of biosphere. Main processes in the biosphere.
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