The Amazon rainforest produces more than 20% the world's oxygen supply.
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It takes a drop of ocean water more than 1,000 years to circulate around the world.
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The Atlantic Ocean is saltier than the Pacific Ocean.
54
Every year, Alaska has about 5,000 earthquakes.
31
10 of the tributaries flowing into the Amazon river are as big as the Mississippi river.
41
More than a dozen men have stood on the surface of the moon, but only three have been to Challenger Deep in the Marianas Trench, the deepest known spot in the ocean.
17
Longest officially recognized place name is Taumatawhakatangihangakoauauotamateapokaiwhenuakitanatahu.
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