WebThe atmosphere and the environment The composition of the atmosphere has changed since the Earth was formed 4.5 billion years ago. Natural processes and human activity have changed the... WebThe BBC is not responsible for the content of external sites. Read about our approach to external linking. Chemistry of the atmosphere - GCSE Chemistry (Single Science) … Get ready for your exams with this BBC Bitesize GCSE Chemistry of the … The Earth’s early atmosphere. The Earth formed approximately 4.6 billion years …
Forming the modern atmosphere - The atmosphere
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How oxygen increased - Developing the atmosphere - BBC Bitesize
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