Across
- 6. Nonliving factors such as water, light, and temperature.
- 7. Founder of modern ecology.
- 11. Element found in nucleic acids, ATP, and phospholipids.
- 13. Flow of freshwater across land.
- 16. A possible answer to a scientific question.
- 18. The study of people, culture, and society.
- 22. Study of the geographic distribution of organisms.
- 23. Common name for harmful algal blooms.
- 24. Living organisms found in an environment.
- 26. The ability to do work or transfer heat.
- 27. Process that converts carbon dioxide into organic carbon.
- 29. The branch of science that studies the natural world.
- 30. One of the central characteristics of the scientific method.
Down
- 1. Process of removing salt from seawater.
- 2. The second most abundant element in living organisms by mass.
- 3. Advocacy for protecting the natural environment.
- 4. Using the senses to gather information.
- 5. A systematic way of gaining knowledge through observation and testing.
- 8. Place where materials are stored.
- 9. A well-supported explanation of why things happen.
- 10. Study of energy.
- 12. The solid outer layer of Earth.
- 14. A systematic body of knowledge based on observation and experimentation.
- 15. All populations of different species living together.
- 17. Includes all living organisms and nonliving components in an area.
- 19. Study of the interactions between organisms and their environment.
- 20. Natural pathway by which essential elements circulate.
- 21. Studies factors affecting population size and composition.
- 25. Freshwater stored beneath Earth's surface.
- 28. Excessive growth of algae and aquatic plants.