1. What is the main energy source for the water cycle?
2. What type of rock is formed by heat and pressure?
3. Which organ system is responsible for transporting nutrients and oxygen throughout the body?
4. What is the process called when liquid water turns into water vapor?
5. What do we call the force that keeps the planets in orbit around the sun?
6. Which layer of the atmosphere do we live in?
7. Which part of the plant is primarily responsible for photosynthesis?
8. What is biodiversity?
9. What is the function of a lever in physics?
10. What phenomenon causes a solar eclipse?