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The origin and evolution of Earth’s atmosphere can be traced through three major stages: the primordial atmosphere, the secondary atmosphere, and the tertiary or present-day atmosphere. The primordial atmosphere was formed during the early stages of Earth’s formation around 4.6 billion years ago. It mainly consisted of light gases like hydrogen and helium, which were captured from the solar nebula. However, due to the weak gravitational field of early Earth and intense solar winds, most of these gases escaped into space. The secondary atmosphere __________ ______ _______ ____ _______ _______.
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