One cubic mile of seawater contains about 50 pounds of gold.
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The Niagara Falls moves upstream at an average rate of about 295ft a century!
48
Mexico City is built on top of an underground resevoir!
47
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
The average ice berg weighs 20,000,000 tons!
54
In 1850, only 8% of the people in California were women.
0
The Caspian Sea is also classed as the world's largest lake.
52