The Amazon rainforest produces more than 20% the world's oxygen supply.
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The state with the longest coastline in the Continental U.S. is Michigan.
31
The Niagara Falls moves upstream at an average rate of about 295ft a century!
48
The Sahara desert expands at about 1km per month.
90
The 'King Ranch' in Texas is bigger than the state of Rhode Island.
49
Australia's Great Barrier Reef is 1,250 miles long!
45
Check your map! Virginia extends farther west than West Virginia.
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