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5 Written questions

5 Matching questions

  1. Explain pressure gradients.
  2. What are the four major pressure areas on Earth?
  3. What is an isopleth?
  4. What does primary circulation in the atmosphere entail?
  5. Explain air pressure tendency.
  1. a Air pressure tendency is important, along with the air pressure reading on a barometer. Falling air pressure, which corresponds to a decrease in the length of mercury in the column on a mercurial barometer, generally indicates stormy weather.
  2. b
    The four major pressure areas on Earth are the Equatorial Low (warm, wet 10 degrees N/S), Polar High (cold, dry 90 N/S), Subtropical High (hot, dry 20-35 N/S), and the Subpolar Low (cool, wet 60 N/S).
  3. c Primary circulation entails global circulation - the mass movement of air all over the globe.
  4. d An isopleth is a line on a weather chart that represents an equal value of some quantity.
  5. e
    Pressure gradients drive air from an area of high pressure to an area of low pressure, creating winds.

5 Multiple choice questions

  1. The wind direction is always reported as the direction from which the wind is blowing. Winds which blow from the west, for example, are westerlies. They blow towards the east. Winds which blow from the south are called southerlies. They blow towards the north.
  2. The Subpolar Low Pressure area consists of the Aleutian Low, the Icelandic Low, and the Polar Front.
  3. Secondary circulation consists of the migration of high and low pressure cells. Major pressure cells move from high pressures to lower pressures, bringing with them fluctuations of temperature and moisture, causing climate.
  4. An isoline connecting all points of highest mean temperature.
  5. The ITCZ stands for the Intertropical Convergence Zone, which is the area along the equator where a discontinuous series of thunderstorms occurs, due to the uplift caused by the convergence of winds and solar heating of the ground along the equator.

5 True/False questions

  1. Describe the Polar High Pressure area.The Subpolar Low Pressure area consists of the Aleutian Low, the Icelandic Low, and the Polar Front.


  2. Describe friction forces.
    Friction forces drag winds as they move across various surfaces. This effect decreases with height above a surface, and causes air spiraling out of a high pressure cell to turn clockwise (anticyclone). Air spiraling out of a low pressure cell turns counter-clockwise (cyclone). NOTE that in the Southern Hemisphere, this effect is in reverse: high pressures produce cyclones, and low pressures produce anticyclones.


  3. What are doldrums?Doldrums refers to a broad east-west belt of light winds that occur along the equator where the Trade Winds from the northern and southern hemispheres converge.


  4. Describe the Equatorial Low Pressure.The Subpolar Low Pressure area consists of the Aleutian Low, the Icelandic Low, and the Polar Front.


  5. Isotach?Equal wind speed.