The Caspian Sea is also classed as the world's largest lake.
52
10 of the tributaries flowing into the Amazon river are as big as the Mississippi river.
41
Every year, Alaska has about 5,000 earthquakes.
31
There's a lake under Antarctica that is 25 million years old called Lake Vostok.
109
The Amazon rainforest produces more than 20% the world's oxygen supply.
182
The water of the Antarctica is so cold that nothing can rot there.
334
More than 25% of the world's forests are in Siberia.
51
Check your map! Virginia extends farther west than West Virginia.
67