Science

1. the region of the atmosphere above the mesosphere and below the height at which the atmosphere ceases to have the properties of a continuous medium
3. (of a liquid, gas, or electricity) move steadily and continuously in a current or stream.
6. A chemical element with an atomic number of 6
8. the regions of the surface and atmosphere of the earth or another planet occupied by living organisms.
10. the action of one object coming forcibly into contact with another.
11. material such as coal, gas, or oil that is burned to produce heat or power.
12. energy that comes from a source and travels through space and may be able to penetrate various materials.
13. the lowest region of the atmosphere, extending from the earth's surface to a height of about 6–10 km
14. the region of the earth's atmosphere above the stratosphere and below the thermosphere, between about 50 and 80 km in altitude.
15. all the waters on the earth's surface, such as lakes and seas, and sometimes including water over the earth's surface, such as clouds.

2. process used by plants and other organisms to convert light energy into chemical energy
4. the layer of the earth's atmosphere above the troposphere,
5. the remains or impression of a prehistoric plant or animal embedded in rock and preserved in petrified form.
7. the thin layer of air that surrounds the earth. It is made up of various gases such as oxygen, nitrogen, carbon dioxides, dust particles and water vapour.
9. the rigid outer part of the earth, consisting of the crust and upper mantle.