Video walkthroughs
Narrated walkthroughs of exam-style questions from this chapter of the book, showing where each mark comes from. Try the question first, then watch. Captions are available in the player.
How Earth's atmosphere changed
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Reading the CO2 record
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Burning and testing hydrocarbons
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Premium includes a walkthrough video for the key questions in every chapter. Each one is narrated step by step, with captions.
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