10 of the tributaries flowing into the Amazon river are as big as the Mississippi river.
41
The Caspian Sea is also classed as the world's largest lake.
52
Due to gravitational effects, you weigh slightly less when the moon is directly overhead.
55
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
It takes a drop of ocean water more than 1,000 years to circulate around the world.
61
An earthquake on Dec. 16, 1811 caused parts of the Mississippi River to flow backwards.
243
The water of the Antarctica is so cold that nothing can rot there.
334
Mexico City is built on top of an underground resevoir!
47