How much oxygen is in the present day atmosphere?
About 20%
How much nitrogen is in the present day atmosphere?
About 78%
How much argon is in the present day atmosphere?
About 1%
Give the other gases present in the present day atmosphere.
Water vapour, carbon dioxide and noble gases
What released gases into the atmosphere for the first billion years?
Volcanoes
What was made from the condensation of water vapour?
Oceans
What gases were probably in the early atmosphere?
Carbon dioxide, water vapour, methane and ammonia
What gas was not probably present in the early atmosphere?
Oxygen
The ‘primordial soup’ theory is one theory of how life was formed millions of years ago, what was needed in this theory?
Hydrocarbons, ammonia and lightning
What produced the oxygen present in today’s atmosphere?
Plants
How was the carbon dioxide from the early atmosphere locked up?
In sedimentary rocks as carbonates and fossils fuels
Oceans act as a reservoir for carbon dioxide, what effect will increased carbon dioxide have?
Make the oceans more acidic and effect the marine environment
How is carbon dioxide in the atmosphere increased?
Burning fossil fuels
What absorbs carbon dioxide from the atmosphere?
Plants for photosynthesis
How can the gases in air be separated?
Fractional distillation
Why can gases in air be separated?
Different boiling points
What is nitrogen used for?
Inert gas in packaging and making fertilisers
What is oxygen used for?
Rockets fuel and medical use
What is argon used for?
Light bulbs and arc welding
