Across
- 4. Earth and _____ are the only inner planets that have moons.
- 5. A small piece of rock moving in space, usually boulder-size or smaller.
- 8. A rocky mass up to several hundred kilometers wide that revolves around the sun.
- 9. Most asteroids orbit in the region between Mars and _____ called the asteroid belt.
- 10. When a meteoroid enters Earth's atmosphere, it forms a _____.
- 11. Comets pass through the solar system in very stretched out and ______ paths.
Down
- 1. A dwarf planet even smaller than Earth's moon.
- 2. If a meteoroid hits Earth's surface, it may leave behind a _____, which is a bowl-shaped indent caused by impact.
- 3. A frozen mass of different types of ice and dust orbiting the sun, coming from areas beyond Neptune.
- 5. If a meteor does not completely burn up in the atmosphere, it may fall to Earth's surface as a _____.
- 6. A _____ planet is a large, round object that revolves around the sun but has not cleared the region around its orbit.
- 7. A natural object that orbits a body bigger than itself.