- The early atmosphere was formed from gases that escaped from volcanoes.
- These gases were water vapour and carbon dioxide.
Scientists analyse rocks that formed at differnet times to provide evidence for how the atmosphere has changed. Volcanic planets like Mars are also used as evidence.
- Oxygen is 1 of the most reactive gases in the atmosphere.
- Oxidation reacions can be seen in rusting metals and the maintenance of fire.
- The type of iron compounds found in rocks shows the oxygen content of the atmosphere. This provides evidence of the levels increasing over time.
- Nitrogen has increased and carbon dioxide has dramatically decreased.
- The evolution of life has changed the atmosphere.
carbon dioxide (g) + water (l) -> glucose (aq) + oxygen (g)
'g' = gas 'l' = liquid 'aq' in solution or dissolved in water
Comments
No comments have yet been made