Global Water & Air Volumes
The water sphere measures 1390 kilometres across and has a volume of 1.4 billion cubic kilometres. This includes all the water in the oceans, seas, ice…
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Did You Know?
Birds do not urinate. Horses and cows sleep while standing. The bat is the only mammal capable of flight. Its leg bones are so thin… -
Where does Wind come from?
Wind is caused by the sun's uneven heating of the earth's surface. Because the earth's surface is made up of different types of land and…