Across
- 1. the amount of energy that is transferred between trophic levels
- 3. gases as a cozy blanket enveloping our planet, helping to maintain a warmer temperature
- 6. the circulation of nutrients through the atmosphere
- 10. pollution, burning fossil fuels, deforestation
- 14. the study of the relations between heat, work, temperature, and energy
- 15. level of an organism is the position it occupies in a food web
- 17. an introduced species that harms its new environment
Down
- 1. all living things and their physical environments within a particular area
- 2. the process by which the mix of species and habitat in an area changes over time
- 3. the current rise in the average temperature of Earth's air and oceans
- 4. a way to measure human impact on nature
- 5. the expulsion of gases, rock fragments, and/or molten lava from within the Earth
- 7. an organism that helps define an entire ecosystem
- 8. a grouping of ecosystems with similar abiotic and biotic conditions
- 9. the contamination of water bodies, with a negative impact on their uses
- 11. the variety of organisms in an area by species, genes, populations and communities
- 12. the ability to continue over a long period of time
- 13. occur when cities are warmer than the rural areas that surround them
- 16. the total amount of living tissue in a trophic level