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Some important events in Earth's history that created the conditions for the emergence of life over thousands of years include: the formation of the planet with impacts from other bodies in the Solar System; the creation of a solid crust, with continents and oceans; the development of an atmosphere with a greenhouse effect; the movement of tectonic plates and volcanic activity; atmospheric electrical phenomena; the formation of simple organic molecules and macromolecules; the emergence of the first primitive cells; the beginning of photosynthesis and the production of oxygen; the creation of the ozone layer and superglaciations that gave rise to new environments.
