Across
- 3. Countries Highly industrialized countries whose citizens have high average incomes.
- 4. Study of the natural and physical processes using structured methods of observation and experimentation.
- 6. Crisis Occurs when human populations grow too quickly for the regions to support.
- 9. Occurs when harmful levels of chemicals or waste materials are introduced into the environment. Examples include: air, water, and soil.
- 11. The irreversible disappearance of a population or a species.
- 12. Science Uses the information provided by pure science to solve problems. Example: engineering, medicine, and environmental science.
- 13. Resources Resources that cannot be replaced. Examples: oil and natural gas.
Down
- 1. Resources Any natural substance that living things use. Examples include: air, soil, minerals, plants, sunlight, animals, and fossil fuels.
- 2. Countries Less industrialized countries whose citizens have low average incomes.
- 5. Science Study of the interaction between the living and nonliving components of the environment.
- 7. Science Seeks to answer questions about how the natural world works. Examples: biology, physics, and chemistry.
- 8. Crisis Occurs when people use up, waste, or pollute natural resources faster than those resources can be renewed, replaced, or cleaned up.
- 10. of Commons problem in which every individual tries to reap the greatest benefit from a given resource.
- 14. Resources Resources that are continually being replaced. Examples: wind, water, forests, and sunlight.