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Across
  1. 3. The rigid outer layer of the Earth made up of rocks and soil.
  2. 9. A condition in which people do not have enough resources to meet their basic needs.
  3. 10. The part of Earth that includes all forms of water on the planet.
  4. 12. The branch of science that studies people, society, and human behavior.
  5. 13. Any form of water, such as rain or snow, that falls from the atmosphere.
  6. 15. The study of interactions among different species living in one area.
  7. 16. A type of environment that includes human beliefs, traditions, and practices.
  8. 17. The study of living organisms, including plants, animals, and microorganisms.
  9. 18. A harmful algal bloom that can poison marine animals and affect humans.
  10. 19. A type of environment that includes landforms, climate, water, and natural resources.
  11. 21. The branch of science that studies the natural world and its processes.
  12. 23. An element that is essential for life and is found in all living organisms.
  13. 27. Water that flows over the ground into rivers, lakes, or oceans after rainfall.
  14. 28. The process of evaluating knowledge, skills, or understanding through questions or activities.
  15. 29. Refers to the nonliving factors that affect organisms in an ecosystem.
Down
  1. 1. The layer of gases that surrounds the Earth and supports life.
  2. 2. A systematic way of learning about the natural world through observation and experiments.
  3. 4. A community of living organisms interacting with their physical environment.
  4. 5. The branch of science that studies the Earth, its materials, and its processes.
  5. 6. The study of matter, energy, motion, and the forces of nature.
  6. 7. The preserved remains or traces of organisms that lived millions of years ago.
  7. 8. A type of cycle in which materials are mainly stored in rocks and soil.
  8. 11. The study of how living organisms interact with one another and their environment.
  9. 14. The study of the geographic distribution of plants, animals, and other organisms.
  10. 17. The part of Earth where all living organisms exist and interact.
  11. 20. The process in which plants release water vapor through their leaves.
  12. 22. A movement that promotes the protection and conservation of the environment.
  13. 24. A gas in the atmosphere that is important for plant growth and protein production.
  14. 25. The process of removing salt from seawater to produce fresh water.
  15. 26. A type of biogeochemical cycle where the main reservoir is found in the atmosphere.