Natural Resources

1. - a mixture of gases composed of 78% Nitrogen, 21% Oxygen, and a tiny percentage of water vapor and other gases.
4. - a natural resource that can never run out, for example: flying a kite
5. 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
7. - is a nonrenewable fossil fuel that is combusted and used to generate electricity.
8. - a partially self-contained environmental and living system
14. - all the factors surrounding that affect a living organism
15. - limited resources that exist in fixed quantities that cannot be replaced or reproduced
16. - colorless and transparent
19. - a layer of natural resources materials on the earth´s surface
20. - the process of humans and nature existing in productive harmony, which permits fulfilling the social, economic, and other requirements of present and future generations

2. resource - a naturally occurring material organism that supports life and can reproduce themselves or can be reproduced by human efforts
3. Fuel - any energy-producing material
6. - all nondomesticated animals
7. by decomposition
9. capacity - the maximum population level for which an ecosystem can provide ongoing food and shelter
10. - a large area of land
11. - inorganic compounds
12. 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
13. - any of numerous greasy usually liquid substances from plant, animal, or mineral sources that do not dissolve in water
17. - natural material made of grains of one or more minerals
18. - a renewable abiotic energy resource that provides energy in the form of heat and light