Venice Island was built on a foundation of tree trunks. 1200 years later, those same trunks still support almost all of central Venice.
8
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 Sahara desert expands at about 1km per month.
90
There's a lake under Antarctica that is 25 million years old called Lake Vostok.
109
The Atlantic Ocean is saltier than the Pacific Ocean.
54
The Amazon rainforest produces more than 20% the world's oxygen supply.
182
There are more than 50,000 earthquakes throughout the world every year!
47