Across
- 4. the main element in organic compounds, so carbon is essential to life on Earth.
- 7. Though energy can be converted from one form to another, energy cannot be created or destroyed.
- 10. The vast majority of our people directly dependent on the nature resources of their country for their basic needs.
- 13. comprises all types of water resources oceans, seas, lakes, rivers, streams, reservoir, polar icecaps, glaciers, and ground water.
- 14. The study of the interactions between life and its physical environment.
- 15. Organized body of knowledge that is obtained by study and experimentation?
Down
- 1. is the outer mantle of the solid earth.
- 2. It cannot be broken down into other types of substances
- 3. Where life operates.
- 5. the smallest particle of an element that still has the properties of that element.
- 6. the protective blanket of gases (N, O2 , Ar, CO2 , trace gases), surrounding the Earth.
- 8. is anything that takes up space and has mass. Matter, in turn, is made up of chemical substances.
- 9. a substance that consists of two or more elements.
- 11. is the ability to do work.
- 12. is done when force is applied to an object over a distance.