Across
- 4. Anything that has mass and takes up space. (6 letters)
- 6. A force that opposes motion between two surfaces. (8 letters)
- 8. The preserved remains of ancient organisms. (6 letters)
- 9. A sudden shaking of the Earth's surface. (10 letters)Neutron
Down
- 1. The process by which plants use sunlight to make food. (14 letters)
- 2. A subatomic particle with no charge found in the nucleus. (7 letters)
- 3. A community of living organisms and their environment. (9 letters)
- 5. The process by which liquid water turns into vapor.
- 6. A push or pull that acts on an object. (5 letters)
- 7. A gas necessary for breathing. (6 letters)