The city of Houston, Texas is built on a swamp and is slowly sinking!
89
The Amazon rainforest produces more than 20% the world's oxygen supply.
182
Every person in the world can fit in Texas and be given over 1000 sq ft in which to live.
14
The warmest temperature ever recorded on Antarctica was 3 degrees F.
175
There's a lake under Antarctica that is 25 million years old called Lake Vostok.
109
The 'King Ranch' in Texas is bigger than the state of Rhode Island.
49
Every year, Alaska has about 5,000 earthquakes.
31
The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
63