Science Vocab

2. Concentration of trace substances at a greater level than occurs in average air
7. brings clear skies and calm air
11. The movement of air caused by cool air over the ocean moving toward the land.
13. Cold dry air. Forms usually over northern Canada and Alaska.
16. Global winds that flow toward the equator, turning west as they go
17. Wispy, feathery clouds made of ice crystals that form at high levels.
18. the movement of air caused by differences in air pressure

1. winds that blow steadily from specific directions over long distances
3. The change from a gas to a liquid
4. Hot, dry air masses mostly in Southwest and northern Mexico
5. Winds that mostly affect the weather in the US and are located between 30 and 60 degrees latitude.
6. a weather system that usually brings stormy weather
8. a cold, moist air mass that is formed over the ocean in polar areas
9. root word meaning middle
10. Located near the poles, winds that blow from East to West between 60 and 90 degrees latitude in both hemispheres.
11. A boundary between air masses that don't move
12. are grayish clouds that often cover the entire sky.
13. Fluffy, white clouds, usually with flat bottoms, that look like rounded piles of cotton.
14. Process by which, in a fluid being heated, the warmer part of the mass will rise and the cooler portions will sink.
15. A line on a weather map that joins places that have the same air pressure