Week 8-9

2. a long, hollow object that is used especially to control the flow of a liquid or gas
5. a hard flat surface for vehicles, people, and animals to travel on
6. the light of the sun
8. having many clouds in the sky
10. a fluid (as hydrogen or air) that has no fixed shape and tends to expand without limit
13. the figure formed by two lines extending from the same point
14. an imaginary animal that can breathe out fire and looks like a very large lizard with wings, a long tail, and large claws
15. the gaseous products of burning materials especially of organic origin made visible by the presence of small particles of carbon
18. to make (a picture, image, etc.) by making lines on a surface
19. a series of thoughts, pictures, or feelings occurring during sleep

1. a written or printed communication
3. to draw air into and expel it from the lungs
4. Past-tense of "do"
6. the space over the Earth where the sun, moon, stars, and clouds appear
7. organs that people and animals use to breathe air
9. to gain knowledge or understanding of or skill in by study, instruction, or experience
11. the dark figure cast on a surface by a body that is between the surface and the light
12. a major category in biological classification that is above the order and below the phylum or division
16. before the usual or expected time
17. a dry substance made up of very tiny pieces of something