Across
- 4. spin on an axis
- 8. protects Earth from radiation
- 11. preserves the atmosphere in Earth's oxygen
- 13. rocky objects that orbit the sun
- 14. measure of the force of gravity on an object
Down
- 1. survives its passage through the atmosphere
- 2. small mass of dust and ice that orbits the sun
- 3. when we see the glowing of a meteoroid
- 5. sun centered modern view of the solar system
- 6. Earth centered old view of the solar system
- 7. Moons and manmade satellites orbit planets (two words)
- 9. Must have an abundant supply of oxygen
- 10. amount of matter in an object
- 12. pull toward the center of the object