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Astronomy: An Overview I - Pgm 12 - The Earth as a planet In this class, professor João Steiner, from the Institute of Astronomy, Geophysics and Atmospheric Sciences at USP, addresses the following topics: the interior of the Earth, tectonic layers and their effects on the surface of the Earth: volcanoes, earthquakes, mountain ranges; the impacts of meteors and comets, the Earth's magnetic field, the greenhouse effect and global warming.