The Sahara desert expands at about 1km per month.
90
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 Caspian Sea is also classed as the world's largest lake.
52
An earthquake on Dec. 16, 1811 caused parts of the Mississippi River to flow backwards.
243
In one day, a full grown redwood tree expels more than 2 tons of water through its leaves.
56
The Niagara Falls moves upstream at an average rate of about 295ft a century!
48
The water of the Antarctica is so cold that nothing can rot there.
334