Across
- 2. a cell that can grow into a new organism
- 4. a force that acts when two things rub together
- 7. the release of a harmful substance into the environment
- 8. a natural object that orbits a planet
- 10. to make more of one's own kind
- 11. to change slowly over time
- 12. the control center of a cell
- 13. a plant part that contains a plant embryo, or tiny new plant, and stored food
- 16. the bending of light when it passes from one material into another
- 17. the path of a body in space around another body
- 19. the thick fluid inside all cells
- 21. curves inward, like a bowl
- 23. a plant part that contains seeds
- 24. an organism that makes its own food
- 25. the force that pulls everything down toward the center of Earth
Down
- 1. a consumer that eats mainly plants
- 2. the upper layer of Earth's land surface, in which plants grow
- 3. dark organic material made up of decayed plant and animal matter
- 5. a body in space that moves in a fixed path around a star
- 6. to spend the winter in an inactive condition that uses little energy
- 9. a push or pull
- 14. a measure of the amount of matter in an object
- 15. the part of Earth made up of the crust and upper part of the mantle
- 18. a material through which heat does not flow easily
- 19. an organism that gets energy by eating other organisms
- 20. a whirling wind that appears as a dark cloud shaped like a funnel
- 22. a hill of sand deposited by wind