Weather and climate

1. The degree of compactness of a substance.
4. a belt of powerful upper-level winds that sits atop the polar front.
10. either of the two locations ( North Pole or South Pole ) on the surface of the earth (or of a celestial object) which are the northern and southern ends of the axis of rotation.
13. an imaginary line drawn around the earth equally distant from both poles, dividing the earth into northern and southern hemispheres and constituting the parallel of latitude 0°.
14. the layers of gases surrounding a planet or other celestial body.
16. the force exerted on a surface by the air above it as gravity pulls it to Earth.
17. the half of the earth that lies north of the equator.
21. The result of Earth's rotation on weather patterns and ocean currents.
22. move or cause to move into a sloping position.
23. belt around the Earth near the equator where sailing ships sometimes get stuck on windless waters.
24. dry, cold prevailing winds that blow from the east.

2. the layer of the earth's atmosphere above the troposphere, extending to about 32 miles (50 km) above the earth's surface (the lower boundary of the mesosphere).
3. Each of the four divisions of the year (spring, summer, autumn, and winter) marked by particular weather patterns and daylight hours, resulting from the earth's changing position with regard to the sun.
5. the lowest region of the atmosphere, extending from the earth's surface to a height of about 3.7–6.2 miles (6–10 km), which is the lower boundary of the stratosphere.
6. The envelope of gases surrounding the earth or another planet.
7. The outermost region of a planet's atmosphere.
8. A current fluid that results from convection.
9. a belt of calm air and sea occurring in both the northern and southern hemispheres between the trade winds and the westerlies.
11. Dry and cold prevailing winds that blow from the east.
12. In the opposite direction to the way in which the hands of a clock move around.
15. model of the mid-latitude segment of Earth's wind circulation,
18. a large-scale atmospheric convection cell in which air rises at the equator and sinks at medium latitudes, typically about 30° north or south.
19. become or make larger or more extensive.
20. the degree or intensity of heat present in a substance or object, especially as expressed according to a comparative scale and shown by a thermometer or perceived by touch.