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Study Guide Quarter 3 Test 3 Weather, Winds and Atmosphere
1. Dry air is 78% nitrogen, 21% Oxygen & 1% of trace gases.
2. As altitude increases, the density of the air decreases
3. Winds tend to move from areas of high pressure toward areas of low pressure
4. Earth's major wind belts are the trade winds, the prevailing westerlies, and the
polar easterlies
5. Conduction is the transfer of heat between objects that touch. Like a hot
spoon on your hand
6. The three main types of clouds are cumulus, stratus, and cirrus
7. At a warm front, warm air meets and moves over cold air
8. The decreasing air pressure of cyclones is often associated with storms and
precipitation
9. Rain or snow usually is associated with falling air pressure
10. On a weather map, isobars join places that have the same air pressure
11. The two most abundant gases in the atmosphere are Nitrogen and Oxygen
12. Oxygen and Nitrogen make up 99% of dry air and trace gases make up the
remaining 1%
13. Water vapor is water in the form of a gas
14. Density is measured by dividing mass over volume or D=M/V
15. Air pressure is measured in Millibars or (mb)
16. Barometers are instruments used to measure air pressure
17. The weather on our planet occurs in the troposphere layer of the atmosphere
18. The layers of the atmosphere from earth to space are troposphere,
stratosphere, mesosphere, and thermosphere
19. The ozone layer in the stratosphere absorbs ultraviolet radiation
20. Winds are caused by differences in air pressure. Winds always flow from High
pressure to Low pressure
21. Wind speed is measured by an anemometer.
22. The winds curve on our planet because of the rotation of the Earth. This is
called the Coriolis Effect
23. Relative humidity can be measured with a psychrometer.
24. Very high feathery clouds are called cirrus clouds
25. Any form of water falling from the sky is precipitation
26. Air Masses that form over Mexico would be hot and dry. These
are continental Tropical air masses or (cT)
27. Cold, dry air affecting the northern United States in winter often comes from
continental polar air masses or (cP)
28. When a warm air mass and a cold air mass meet and no movement occurs,
the result is a stationary front
29. When a warm air mass collides with a cold air mass, it forms a warm front
30. A funnel-shaped cloud that touches Earth's surface is called a tornado.
31. Weather forecasting has improved recently because of computer technology
32. Meteorologists are People who study weather and try to predict it.
33. Collecting of weather data in the last 40 years has been improved mostly by
balloons and satellites
34. Isobars are lines on a map joining places that have the same air pressure.
35. On weather maps, a line with half circles indicates a warm front
36. Isotherms are lines on a map joining places that have the same
temperatures.