1 - Earth is a ball of molten rock. No atmosphere is present., 2 - Earth is still too hot for any surface water. Its surface is covered in volcanoes., 3 - Earth starts to cool down. Water vapour begins to condense and oceans are formed., 4 - Life begins in the oceans. Simple plants called cyanobacteria use carbon dioxide in photosynthesis. Ozone forms and oxygen levels start to rise., 5 - Land plants start to appear. Oxygen levels rise rapidly., 6 - Balance between carbon dioxide and oxygen is achieved., 7 - Animals evolve due to the increase in oxygen., 8 - Carbon dioxide levels rise due to pollution. Global warming starts - weather patterns are affected.,

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