- Almost all of the Oxygen in the Earth’s atmosphere has been produced by living organisms. Oxygen accounts for 21% of our atmosphere, with Nitrogen making up 78%, and a mixture of other gases composing the remaining 1%. Oxygen only occurs as a minor constituent in the atmospheres of other planets in our Solar System. Some rocks found on Earth are actually pieces of Mars!
- Due to the fact that water expands when heated, the Atantic ocean increses in width by 3cm every year!
- The Earth has the highest average density (5.52 g/cubic cm) of any planet in our Solar System. Saturn has the lowest (0.69 g/cubic cm). For reference, the density of liquid water is 1 g/cubic cm.
- During a lunar eclipse, one can view the curved shape of the Earth’s shadow, which is naked eye, groundbased evidence that the Earth is indeed round.
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