Atmosphere
- Created by: izzygreenxoxo
- Created on: 07-04-17 16:06
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- Atmosphere
- The Evolution of the Atmosphere
- Phase 1
- Surface was originally molten - millions of years
- So hot - any atmosphere boiled away
- Eventually things cooled down - thin crust - volcanoes still erupt
- Volcanoes give out lots of gas - how oceans and atmosphere formed
- Early atmosphere - mostly CO2 - virtually no oxygen - small amounts of methane, water vapour and ammonia
- Like mars and venus now
- Oceans formed when water vapour evaporated
- Surface was originally molten - millions of years
- Phase 2
- Green plants and algae - like CO2 atmosphere
- CO2 dissolve in oceans - photosynthesis by green plants and algae
- Plants died - carbon and hydrocarbons got locked inside - we burn them as fossil fuels
- Phase 3
- Buildup of oxygen - killed early organisms - allow new complex organisms
- Oxygen - ozone layer - block harmful rays
- Virtually no CO2 left
- Phase 1
- Life, Resources and Atmospheric Change
- Primordial soup theory
- Earth's atmosphere was rich with nitrogen, hydrogen, ammonia nd methane
- Lightning struck - chemical reaction - forms amino acids
- Amino acids kept in body of water
- Amino acids gradually combine to form organic matter - living organisms
- 1950 - Miller and Urey experimented - theory on the right lines but not correct
- Earth has all resources humans need
- All products needed are in air - fractionally distil air to get them
- Air is filtered to remove dust
- Cooled to -200*C - liquid
- Water vapour condenses - removed
- CO2 freezes - removed
- Liquid then slowly heated
- Remaining gases separated from fractional distillation - oxygen and argon come out together - separated again
- Liquid then slowly heated
- CO2 freezes - removed
- Water vapour condenses - removed
- Cooled to -200*C - liquid
- Air is filtered to remove dust
- All products needed are in air - fractionally distil air to get them
- Increasing CO2 - affect climate + oceans
- Causes global warming
- Makes oceans acidic as they store CO2 - kills coral and shellfish
- Primordial soup theory
- The Evolution of the Atmosphere
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