The state with the longest coastline in the Continental U.S. is Michigan.
31
Australia's Great Barrier Reef is 1,250 miles long!
45
The Amazon rainforest produces more than 20% the world's oxygen supply.
182
The Niagara Falls moves upstream at an average rate of about 295ft a century!
48
More than 25% of the world's forests are in Siberia.
51
The warmest temperature ever recorded on Antarctica was 3 degrees F.
175