Across
- 2. A substance made of only one type of atom
- 4. Two or more atoms chemically bonded together
- 8. An organism that makes its own food
- 11. An organism that breaks down dead plants and animals
- 12. The average weather in a place over a long period of time
- 14. The smallest unit of life
- 15. A substance made from two or more different elements
- 17. The control center of a cell
- 18. A force that pulls objects toward each other
- 19. Smallest unit of matter
- 20. A change in speed or direction over time
Down
- 1. The day-to-day conditions of the atmosphere
- 3. An organism that eats plants or animals
- 5. The ability to do work or cause change
- 6. The process plants use to make food using sunlight
- 7. Speed in a specific direction
- 9. Living and nonliving things interacting in an area
- 10. A push or a pull that can change motion
- 13. The movement of Earth’s tectonic plates
- 16. How much mass is in a certain volume