Australia's Great Barrier Reef is 1,250 miles long!
45
The city of Houston, Texas is built on a swamp and is slowly sinking!
89
The average ice berg weighs 20,000,000 tons!
54
More than 25% of the world's forests are in Siberia.
51
The Niagara Falls moves upstream at an average rate of about 295ft a century!
48
The Amazon rainforest produces more than 20% the world's oxygen supply.
182
The Dallas/Ft. Worth airport is larger than New York City's Manhattan Island.
62