1. What planet is known as the Red Planet?

2. How many planets are in our solar system?

3. Which planet is closest to the Sun?

4. Which planet has the most moons?

5. Which planet is the largest in our solar system?

6. What type of celestial body is the Sun?

7. What force keeps planets in orbit around the Sun?

8. What is the most abundant element in the universe?

9. Who developed the theory of relativity?

10. Which scientist proposed the laws of motion?

11. What natural phenomenon is measured by the Richter scale?

12. What is the study of earthquakes called?

13. What unit is used to measure electrical resistance?

14. What is the heaviest naturally occurring element?

15. What type of rock is formed from cooled lava?

16. What is the freezing point of water in Fahrenheit?

17. What is the boiling point of water at sea level in Celsius?

18. What is the process of water changing from liquid to gas called?

19. What is the hardest natural substance on Earth?

20. What is the only metal that is liquid at room temperature?