Across
- 3. tension the “skin” on the top of water that lets some bugs walk on it
- 9. all the members of one species living in one place
- 12. living things in nature, like trees, bugs, and people
- 14. growth when a population grows faster and faster
- 16. food-like substances that plants and animals need to live and grow
- 17. oxygen oxygen mixed in water that fish and other animals need
- 18. all the different species living together in one place
- 19. bonds weak connections between water molecules that make water special
- 20. a type of nutrient plants need, but too much can harm water
- 22. growth when the number of individuals in a group goes up
Down
- 1. when liquid water changes into gas and goes into the air
- 2. too many nutrients in water that cause too much algae
- 4. living and nonliving things that interact in one area
- 5. zones parts of water with little or no oxygen, where animals can’t live
- 6. a group of the same kind of living thing, like all lions
- 7. when one end of a molecule is slightly positive and the other is negative
- 8. Algal Bloom when algae grow too much and hurt other life in water
- 10. a number that shows if something is acidic, basic, or neutral
- 11. how clear or cloudy water looks
- 13. water that flows over land and carries dirt or pollution into rivers or lakes
- 15. factor something that keeps a population from growing too big
- 18. capacity the biggest number of organisms an area can support
- 21. nonliving things in nature, like sunlight, rocks, or air