The city of Houston, Texas is built on a swamp and is slowly sinking!
89
Australia's Great Barrier Reef is 1,250 miles long!
45
The Niagara Falls moves upstream at an average rate of about 295ft a century!
48
More than a dozen men have stood on the surface of the moon, but only three have been to Challenger Deep in the Marianas Trench, the deepest known spot in the ocean.
17
The average ice berg weighs 20,000,000 tons!
54
The 'King Ranch' in Texas is bigger than the state of Rhode Island.
49
There are more than 50,000 earthquakes throughout the world every year!
47
The Amazon rainforest produces more than 20% the world's oxygen supply.
182