1. In 1783 an Icelandic eruption threw up enough dust to temporarily block out the sun over Europe.
2.About 20 to 30 volcanoes erupt each year, mostly under the sea.
3.A huge underground river runs underneath the Nile, with six times more water than the river above.
4.Off the coast of Florida there is an underwater hotel. Guests have to dive to the entrance.
5.The Ancient Egyptians worshipped a sky goddess called Nut.
6.The world's windiest place is Commonwealth Bay, Antartica.
7.American Roy Sullivan has been struck by lighting a record seven times.
8.The desert baobab tree can store up to 1000 litres of water in its trunk.
9.The USA uses 29% of the world's petrol and 33% of the world's electricity.
10.Tibet is the highest country in the world. Its average height above sea level is 4500 meters.
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