Science

1. the action of buying and selling goods and services.
6. a large plant-eating domesticated mammal with solid hoofs and a flowing mane and tail, used for riding, racing, and to carry and pull loads.
11. the envelope of gases surrounding the earth or another planet.
14. model of the mid-latitude segment of Earth's wind circulation
15. 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. The thermosphere is characterized throughout by an increase in temperature with height
16. an effect whereby a mass moving in a rotating system experiences a force (the Coriolis force ) acting perpendicular to the direction of motion and to the axis of rotation. On the earth, the effect tends to deflect moving objects to the right in the northern hemisphere and to the left in the southern and is important in the formation of cyclonic weather systems.
17. a constituent of atmospheric circulation
20. Something that is prevalent or most common
21. in the opposite direction of the way in which the hands of a clock move around.
22. the angular distance of a place north or south of the earth's equator, or of a celestial object north or south of the celestial equator, usually expressed in degrees and minutes.
24. in the same direction as the way in which the hands of a clock move around.
26. a current in a fluid that results from convection.

2. the force exerted on a surface by the air above it as gravity pulls it to Earth
3. 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°.
4. measure of hotness or coldness expressed in terms of any of several arbitrary scales, such as Fahrenheit, Celsius, or Kelvin.
5. the lowest atmospheric layer; from 4 to 11 miles high (depending on latitude)
7. the outermost region of a planet's atmosphere.
8. on the surface of the earth (or of a celestial object) which the northern ends of the axis of rotation.
9. an equatorial region of the Atlantic Ocean with calms, sudden storms, and light unpredictable winds
10. the highest layer of the atmosphere in which the gases are all mixed up rather than being layered by their mass.
12. a large-scale atmospheric convection cell in which air rises at the equator and sinks at medium latitudes, typically about 30° north or south.
13. on the surface of the earth (or of a celestial object) which are the southern ends of the axis of rotation.
18. the very highest levels of a profession or other sphere, or of prices or other quantities.
19. the degree of compactness of a substance
23. decrease in size, number, or range
25. become or make larger or more extensive