1. What is Earth's mantle?
2. What elements make up the Earth's mantle?
3. Describe the "big splash" theory of the Moon's origin?
4. How are comets different from asteroids?
5. Of what are comets made? And asteroids?
6. If you grew up on the moon, would your bones be heavier or lighter than they are now?
7. Look up New Horizons space probe. Where is it heading and where is it right now?
8. Where are the tallest and longest mountain chains on Earth? How were they formed?
9. How do we know that tectonic plates move?