Across
- 3. physical substance in general, as distinct from mind and spirit; (in physics) that which occupies space and possesses rest mass, especially as distinct from energy.
- 5. the process of making an area more urban.
- 6. cycle by which nitrogen is converted into multiple chemical forms as it circulates among atmosphere, terrestrial, and marine ecosystems.
- 9. a natural fuel such as coal or gas, formed in the geological past from the remains of living organisms.
- 10. the process in which carbon atoms continually travel from the atmosphere to the Earth and then back into the atmosphere
Down
- 1. excessive richness of nutrients in a lake or other body of water,
- 2. the variety of life in the world or in a particular habitat or ecosystem.
- 4. he continuous movement of water within the Earth and atmosphere.
- 7. prevention of wasteful use of a resource.
- 8. the capacity for doing work. ... It may exist in potential, kinetic, thermal, electrical, chemical, nuclear, or other various forms