Across
- 5. Organ that pumps blood throughout the body
- 6. Layer of gases that surround Earth
- 8. Green pigment in plants that absorbs light for photosynthesis
- 9. The scientist who proposed the three laws of motion
- 11. Heat transfer through direct contact
- 13. Powerhouse of the cell
- 14. Natural satellite of Earth
- 15. Solid Earth layer beneath soil and water
Down
- 1. Gas plants take in during photosynthesis
- 2. Inherited characteristics from parents to offspring
- 3. The force that pulls objects toward Earth
- 4. Smallest unit of life
- 7. Planet known as the "Red Planet"
- 8. The process of changing liquid water into vapor
- 10. An animal that eats only plants
- 12. The path Earth takes around the Sun