Due to gravitational effects, you weigh slightly less when the moon is directly overhead.
55
The Niagara Falls moves upstream at an average rate of about 295ft a century!
48
A volcano has enough power to shoot ash as high as 50 km into the atmosphere.
59
There are more than 50,000 earthquakes throughout the world every year!
47
Every year, Alaska has about 5,000 earthquakes.
31
The Sahara desert expands at about 1km per month.
90