The Amazon rainforest produces more than 20% the world's oxygen supply.
182
The North Atlantic gets 2.5 centimetres (1in) wider every year.
119
Forest fires move faster uphill than downhill.
52
One cubic mile of seawater contains about 50 pounds of gold.
79
The Atlantic Ocean is saltier than the Pacific Ocean.
54
Israel's Dead Sea is 1,312 feet below sea level.
48
Australia's Great Barrier Reef is 1,250 miles long!
45
The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
63