It takes a drop of ocean water more than 1,000 years to circulate around the world.
The North Atlantic gets 2.5 centimetres (1in) wider every year.
Every year, Alaska has about 5,000 earthquakes.
More than 25% of the world's forests are in Siberia.
A volcano has enough power to shoot ash as high as 50 km into the atmosphere.
Israel's Dead Sea is 1,312 feet below sea level.