Discuss the origin and evolution of earth's atmosphere.

The origin and evolution of Earth's atmosphere is a complex process influenced by geological, biological, and cosmic factors over billions of years. It can be divided into three primary stages: the primordial atmosphere, the secondary atmosphere, and the modern atmosphere. Each stage represents significant changes in the composition and dynamics of atmospheric gases, shaping the climate and enabling life to flourish.

The primordial atmosphere formed during Earth's early accretion around 4.6 billion years ago. Initially, the atmosphere was composed mainly of hydrogen and helium, the _______ ___ _______ _________ ____ ______.
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