Across
- 5. The study of the Earth's oceans
- 9. A celestial body that orbits a star
- 10. The study of the structure and function of the human body
- 12. The Earth's outermost layer
- 13. A measure of the total amount of matter in an object
- 15. The study of the Earth's landforms and surface features
Down
- 1. The process by which plants lose water vapor
- 2. A chemical element essential for life, symbol O
- 3. The process by which plants and some bacteria convert sunlight into energy
- 4. The bending of light as it passes through different mediums
- 6. A subatomic particle found in the nucleus of an atom
- 7. A device that measures electrical voltage
- 8. The branch of science that studies the behavior of matter
- 11. A force that opposes motion
- 14. The smallest unit of a compound