Clue: O for this help up a mountain!
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- Roughly 21% of the atmosphere
- Element 8
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- Gas discovered by Joseph Priestley, d. 1804
- Second commonest element in air
- Element essential to combustion
- A combustible element
- Gas forming about 20 per cent of atmosphere
- Gas essential to life
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- Gas required for life
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- Second-in-command co-ordinates facts of life support