| 1. ozone |
the
natural surface features of a tract of land, esp. considered in
relation to some use or activity. |
| 2. atmosphere |
the
center part of the Earth. |
| 3. equator |
the
layer of the earth that lies between the crust and the core. |
| 4. rotation |
the
mass of gases surrounding the earth or any other celestial body. |
| 5. mantle |
the outer
portion of the earth or other planet, or of a moon. |
| 6. drought
(drouth) |
to
treat (waste products) for reuse or so as to recover reusable materials. |
| 7. core |
the
vast expanse of salt water covering approximately three quarters
of the earth's surface. |
| 8. revolution |
oxygen
in the form of molecules with three atoms, created by exposure of
oxygen to electrical discharge or ultraviolet radiation, having
a sharp smell, and being an effective oxidant for use in bleaching
and sterilizing. |
| 9. recycle |
the
imaginary circle around the earth's globe equidistant from both
the North and South Poles. |
| 10. erosion |
a
straight line that serves as the unmoving center about which a body
or figure turns. |
| 11. terrain |
an
unusually prolonged lack of rain. |
| 12. axis |
the
act of turning on or around an axis. |
| 13. crust |
the process
by which material from the earth's surface is worn away by forces
such as glaciers, wind, and waves. |
| 14. ocean |
orbital
motion around a given point. |
