The warmest temperature ever recorded on Antarctica was 3 degrees F.
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The Amazon rainforest produces more than 20% the world's oxygen supply.
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Every year, Alaska has about 5,000 earthquakes.
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A volcano has enough power to shoot ash as high as 50 km into the atmosphere.
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An earthquake on Dec. 16, 1811 caused parts of the Mississippi River to flow backwards.
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The North Atlantic gets 2.5 centimetres (1in) wider every year.
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Check your map! The Pacific entrance of the Panama Canal is farther East than the Atlantic entrance.
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