Discover Magazine has put together a list of things that you don't know about the Earth. I'll give you the run down and you can read the specifics on your own time.
1. The Earth is smoother than a billiard ball
2. The Earth is an oblate spheroid
3. The Earth isn't a oblate spheroid
4. The Earth is not exactly aligned with it's geoid
5. Jumping into a hole through the center of the Earth is like orbiting it
6. The Earth's interior is hot due to impacts, shrinkage, sinkage, and radioactive decay
7. The Earth has at least five natural moons. But not really
8. The Earth is getting more massive
9. Mt. Everest isn't the biggest mountain
10. Destroying the Earth is hard
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