10 of the tributaries flowing into the Amazon river are as big as the Mississippi river.
41
Australia's Great Barrier Reef is 1,250 miles long!
45
More than 25% of the world's forests are in Siberia.
51
Venice Island was built on a foundation of tree trunks. 1200 years later, those same trunks still support almost all of central Venice.
8
One cubic mile of seawater contains about 50 pounds of gold.
79
Forest fires move faster uphill than downhill.
52
There's a lake under Antarctica that is 25 million years old called Lake Vostok.
109