Earth
Etymology
eorðe - (eorthe) - Old English -> Earth
terra - (terra) - Latin -> Terra
γῆ - (ge) - Greek -> Gaia
Information
3rd Planet from the sun
4.5 billion years old, estimated
The surface is 29% land and 71% water
The atmosphere (air) is 78% Nitrogen and 21% Oxygen
It takes 365.26 days to orbit around the sun, hence leap years
It takes 24.9 hours to rotate on its axis
The earth is tilted at 23.5 degrees