The average ice berg weighs 20,000,000 tons!
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More than 25% of the world's forests are in Siberia.
51
The Caspian Sea is also classed as the world's largest lake.
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The Sahara desert expands at about 1km per month.
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Every year, Alaska has about 5,000 earthquakes.
31
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
One cubic mile of seawater contains about 50 pounds of gold.
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