Across
- 4. What traps energy and causes the temperatures to increase
- 7. What are millions of small, rocky objects called?
- 8. Earth's period of______ is one year
- 9. What planet has a moon,and solid inner core is surrounded by liquid water?
- 10. What is used to measure the distance form earth to the Sun?
Down
- 1. The planets closest to the sun are called what?
- 2. What is made of gas, dust, and ice and moves around the Sun?
- 3. What are the planets made of rock and metal called?
- 5. completes one rotation
- 6. Which planet has not atmosphere?