Across
- 1. Branch of biology dealing with interactions among organisms and their environment.
- 3. Maximum population size of the species that the environment can sustain indefinitely.
- 8. Tourism directed towards exotic, often threatened, natural environments.
- 10. Biogeochemical cycle that transforms nitrogen and nitrogen-containing compounds.
- 11. Increase in the proportion of people living in urban areas.
- 13. Process by which moisture is carried through plants from roots to small pores on the underside of leaves.
- 14. Substance capable of causing cancer in living tissue.
- 15. Species at risk of extinction.
- 16. Thick subsurface layer of soil that remains frozen throughout the year.
- 19. Process by which green plants use sunlight to synthesize foods with carbon dioxide and water.
- 22. Urban planning approach that focuses on sustainable development.
- 25. Cultivation of a single crop in a given area.
- 27. Community of living organisms interacting with their non-living environment
- 29. Process of converting waste into reusable material.
- 33. Increase in the concentration of toxins as they move up the food chain.
- 35. Lowest region of the atmosphere, where weather occurs.
- 40. Meeting needs of the present without compromising future generations.
- 41. Natural fuels formed from the remains of living organisms.
- 43. Rainfall made acidic by atmospheric pollution.
- 44. Process by which a species becomes better suited to its environment.
- 45. Depleting the stock of fish in a body of water by too much fishing.
- 46. Total mass of organisms in a given area or volume.
- 47. Flat area of land next to a river or stream, prone to flooding.
- 48. Long-term alteration of temperature and typical weather patterns in a place.
Down
- 1. Measure of human demand on Earth's ecosystems.
- 2. Global sum of all ecosystems; zone of life on Earth.
- 4. Farming of aquatic organisms such as fish, crustaceans, and aquatic plants.
- 5. All the waters on Earth's surface, including lakes, seas, and oceans.
- 6. Series of processes by which carbon compounds are interconverted in the environment.
- 7. Triatomic molecule, O3, found in the Earth's stratosphere.
- 9. Variety of life in a particular habitat or ecosystem.
- 12. Process by which soil and rock are removed from the Earth's surface by wind or water flow.
- 17. Type of energy source that is naturally replenished.
- 18. Gases that trap heat in the atmosphere, contributing to global warming.
- 20. Clearing of trees, transforming a forest into cleared land.
- 21. Concern about and action aimed at protecting the environment.
- 23. Capable of being decomposed by bacteria or other living organisms.
- 24. Contamination of air, water, or soil by harmful substances.
- 26. Total greenhouse gas emissions caused by an individual, event, organization, or product.
- 28. Land area that is saturated with water, either permanently or seasonally.
- 30. Process of settling or being deposited as sediment.
- 31. Non-native species that spread widely and cause harm to the environment.
- 32. Accumulation of soluble salts in soil, hindering crop growth.
- 34. Type of renewable energy derived from the Earth's internal heat.
- 36. Natural home or environment of an animal, plant, or other organism.
- 37. Protection and preservation of natural resources.
- 38. Able to be maintained at a certain rate or level without depleting resources.
- 39. Process by which fertile land becomes desert.
- 42. Rigid outer part of the Earth, consisting of the crust and upper mantle.
- 44. Proportion of light or radiation that is reflected by a surface.