Venice Island was built on a foundation of tree trunks. 1200 years later, those same trunks still support almost all of central Venice.
8
Australia's Great Barrier Reef is 1,250 miles long!
45
The Niagara Falls moves upstream at an average rate of about 295ft a century!
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The Caspian Sea is also classed as the world's largest lake.
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A waterfall known as The Devil's Kettle empties water into a hole and nobody knows where it ends up!
18
The warmest temperature ever recorded on Antarctica was 3 degrees F.
175
10 of the tributaries flowing into the Amazon river are as big as the Mississippi river.
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