C13.1 History of our atmosphere
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How have scientists reconstructed what they think the atmosphere was like billions of years ago?
➢ Using gas bubbles trapped in ancient rocks ➢ Data gathered from the atmospheres of other planet and their moons in the solar system
What is the volcanic theory that suggest how oceans formed on earth?
➢ Volcanoes released CO2, H20 and nitrogen ➢ Water vapour in the atmosphere condensed as the Earth gradually cooled down, and fell as rain ➢ Water collected in hollows in the crust and the first oceans formed
What is the comet theory?
➢ An icy comet rained down on the surface on the Earth, they melted, adding to its water supplies
How did oxygen get in the atmosphere?
➢ Scientists think that life began with the first simple organisms ➢ Then after 700 million years, bacteria and other simple organisms such as algae evolved, ➢ Algae could use the energy from the Sun to make their own food through photosynthesis ➢ Over the next billion years the levels of oxygen rose steadily as the algae and bacteria thrived in seas
What is the equation for photsysthesis?
➢ Carbon dioxide + water makes glucose + oxygen
What did the Earth’s early atmosphere consist of?
➢ Ammonia, Nitrogen, water vapour and carbon dioixde