Australia's Great Barrier Reef is 1,250 miles long!
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The Sahara desert expands at about 1km per month.
90
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
Due to gravitational effects, you weigh slightly less when the moon is directly overhead.
55
The Atlantic Ocean is saltier than the Pacific Ocean.
54
Every year, Alaska has about 5,000 earthquakes.
31
There are more than 50,000 earthquakes throughout the world every year!
47