The city of Houston, Texas is built on a swamp and is slowly sinking!
89
If Manhattan had the same population density as Alaska, there would only be 15 people living there.
138
The Niagara Falls moves upstream at an average rate of about 295ft a century!
48
Europe is the only continent without a desert.
62
The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
63
The warmest temperature ever recorded on Antarctica was 3 degrees F.
175
Australia's Great Barrier Reef is 1,250 miles long!
45
In one day, a full grown redwood tree expels more than 2 tons of water through its leaves.
56