10 of the tributaries flowing into the Amazon river are as big as the Mississippi river.
41
One cubic mile of seawater contains about 50 pounds of gold.
79
The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
63
A volcano has enough power to shoot ash as high as 50 km into the atmosphere.
59
The 'King Ranch' in Texas is bigger than the state of Rhode Island.
49
Every person in the world can fit in Texas and be given over 1000 sq ft in which to live.
14