It takes a drop of ocean water more than 1,000 years to circulate around the world.
61
The city of Houston, Texas is built on a swamp and is slowly sinking!
89
If Manhattan had the same population density as Alaska, there would only be 15 people living there.
138
Israel's Dead Sea is 1,312 feet below sea level.
48
Due to gravitational effects, you weigh slightly less when the moon is directly overhead.
55
The Caspian Sea is also classed as the world's largest lake.
52
The Sahara desert expands at about 1km per month.
90
Venice Island was built on a foundation of tree trunks. 1200 years later, those same trunks still support almost all of central Venice.
8