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.
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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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A volcano has enough power to shoot ash as high as 50 km into the atmosphere.
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Longest officially recognized place name is Taumatawhakatangihangakoauauotamateapokaiwhenuakitanatahu.
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The warmest temperature ever recorded on Antarctica was 3 degrees F.
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The Caspian Sea is also classed as the world's largest lake.
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