Fun Fact Friday (#63)

Fun Fact Friday is a meme hosted by Lettora at I’m Booked! If you’d like to join and do your own Fun Fact Friday, just ask! At I’m Booked! Every week we’ll give you five new, fun facts. This week’s five facts:

1.  A quarter of all ice-free land in the world is used for grazing livestock.

2.  The gastric-brooding frog gives birth through its mouth.

3.  Oceans cover 71% of the Earth's surface.

4.  63 Earths can fit inside Uranus.

5.  43% of the world's olive oil production is done in Spain.