Across
- 2. - A mountain with a vent through which molten rock and gases erupt.
- 4. - The force that pulls objects towards each other.
- 7. - The process by which green plants use sunlight to convert carbon dioxide and water into food.
- 9. - A community of living organisms and their environment.
- 11. - The application of scientific knowledge and mathematics to create solutions to practical problems.
- 12. The branch of technology that deals with the design, construction, and operation of robots.
- 17. - Capable of being broken down naturally by living organisms.
- 19. An instrument used to see objects that are too small to be seen by the naked eye.
- 20. - The remains or traces of plants and animals that lived long ago.
Down
- 1. - The variety of life forms in a particular habitat or ecosystem.
- 3. - A characteristic or behavior that helps an organism survive and reproduce in its environment.
- 5. - An object that attracts certain materials, such as iron or steel.
- 6. - The ability to do work or cause change.
- 8. - The force that resists the motion of objects sliding against each other.
- 10. - The genetic material present in all living organisms.
- 13. - An instrument used to view distant objects in space.
- 14. System - The collection of planets, moons, asteroids, and other celestial objects that orbit around the Sun.
- 15. A path along which electric current can flow.
- 16. - A material through which electric current can pass easily.
- 18. The force that pulls objects towards each other.