1. What is the closest planet to the Sun?

2. Which part of the human eye controls the amount of light entering?

3. What is the largest bone in the human body?

4. Which gas makes up most of Earth's atmosphere?

5. Which animal is known for having the strongest bite force?

6. What type of star is the Sun?

7. Which natural disaster is measured using the Richter scale?

8. Which planet has the Great Red Spot?

9. What is the process by which plants make food?

10. Which animal is the largest mammal on Earth?