Across
- 4. in which all variables are controlled except one, allow scientists to be more confident that any differences observed were caused by the factor they are investigating.
- 9. a method promoted by the Global Footprint Network to measure human demand on natural capital, i.e. the quantity of nature it takes to support people and their economies.
- 10. is a testable idea that attempts to explain a phenomenon or answer a scientific question.
- 12. a variable the scientist manipulates.
- 13. Is a social movement dedicated to protecting the natural world--and, by extension, people--from undesirable changes brought by human actions.
- 14. a hydrocarbon-containing material such as coal, oil, and natural gas, formed naturally in the Earth's crust from the remains of dead plants and animals that is extracted and burned as a fuel.
Down
- 1. Includes all the living and nonliving things with which organisms interact
- 2. a natural resource that cannot be readily replaced by natural means at a pace quick enough to keep up with consumption.
- 3. Science is the study of how the natural world works, how our environment affects us, and how we affect our environment.
- 5. a variable that depends on the conditions set up in the experiment.
- 6. able to be maintained at a certain rate or level.
- 7. which are specific statements about what we would expect to observe if the hypotheses are true.
- 8. a natural resource which will replenish to replace the portion depleted by usage and consumption, either through natural reproduction or other recurring processes in a finite amount of time in a human time scale.
- 11. Materials, and energy sources found in nature, that humans need to survive.