GLOBAL SYSTEMS

3. Nonreactive gas that forms about 78% of the earth's atmosphere.
6. Form of light we cannot see but can feel as heat.
8. Circulation in the Pacific which depends upon conjoint effect of temperature and salinity.
10. Outer part of earth, consists of crust and upper mantle.
11. Layer of ice covering extensive tract of land for a long period of time.
14. The trapping of the sun's warmth.
16. Period of milder climate between two glacial periods.
21. Effects the global climate, warm water in the pacific.
22. Colorless, odorless, flammable chemical compound found throughout the earth.
23. Our living world.
24. All the waters on the earths surface.

1. The state of the atmosphere at a given time and place with regards to temperature, moisture, wind velocity.
2. The changing of water vapor back into liquid state and forming clouds by using cold temperatures.
4. Plants and other organisms convert the suns light to energy.
5. A measure of the average temperature, humidity, wind, precipitation and meteorological patterns.
7. Gases and other particles released into the atmosphere by burning fuels.
9. The clearing of natural trees in forest areas.
12. A substance that can be replaced and is of economic value.
13. Naturally occurring chemical compound.
15. Natural fuel formed millions of years ago from the remains of living organisms e.g coal
17. A layer of gases surrounding the Earth
18. Parts of the radio spectrum with relatively long wavelengths.
19. A energy type derived from renewable plant and animal materials.
20. All the living organisms existing together in a particular area .
25. Energy that comes from a source which is able to penetrate various materials e.g light, radio microwaves.
26. Soil that remains bellow the freezing point of water for two or more years.