One cubic mile of seawater contains about 50 pounds of gold.
Amazon rainforest oxygen supply
The Amazon rainforest produces more than 20% the world's oxygen supply.
More Geography Facts
Gold in seawater
More than 25% of the world's forests are in Siberia.
1,000 years to circulate
It takes a drop of ocean water more than 1,000 years to circulate around the world.