Natural Resources

2. - a mixture of gases composed of 78% Nitrogen, 21% Oxygen, and a tiny percentage of water vapor and other gases.
3. by decomposition
5. - a natural resource that can never run out, for example: flying a kite
6. - a renewable abiotic energy resource that provides energy in the form of heat and light
7. - a large area of land
12. - the process of humans and nature existing in productive harmony, which permits fulfilling the social, economic, and other requirements of present and future generations
15. - a partially self-contained environmental and living system
17. - inorganic compounds
19. - a nonrenewable fossil fuel that is combusted and used to generate electricity.

1. - colorless and transparent
4. - all the factors surrounding that affect a living organism
7. web - a set of overlapping food chains that contain sequences of organisms, each of which provides a source of nutrients for the next organisms in the chain
8. - limited resources that exist in fixed quantities that cannot be replaced or reproduced
9. resource - a naturally occurring material organism that supports life and can reproduce themselves or can be reproduced by human efforts
10. capacity - the maximum population level for which an ecosystem can provide ongoing food and shelter
11. - a layer of natural resources materials on the earth´s surface
13. species - any species that is non-native or alien to an ecosystem and whose introduction causes or is likely to cause economic or environmental harm
14. Fuel - any energy-producing material
16. - all nondomesticated animals
18. - natural material made of grains of one or more minerals