10 of the tributaries flowing into the Amazon river are as big as the Mississippi river.
41
More than 25% of the world's forests are in Siberia.
51
The water of the Antarctica is so cold that nothing can rot there.
334
More than a dozen men have stood on the surface of the moon, but only three have been to Challenger Deep in the Marianas Trench, the deepest known spot in the ocean.
17
The average ice berg weighs 20,000,000 tons!
54
Israel's Dead Sea is 1,312 feet below sea level.
48