Mexico City is built on top of an underground resevoir!
47
Forest fires move faster uphill than downhill.
52
The average ice berg weighs 20,000,000 tons!
54
Every year, Alaska has about 5,000 earthquakes.
31
The Dallas/Ft. Worth airport is larger than New York City's Manhattan Island.
62
More than 25% of the world's forests are in Siberia.
51
Forest growth in the US has exceeded harvest since the 1940’s. Today, we have more trees than any time in the past 100 years.
14