METR 104:
Our Dynamic Weather
Pre-class Quiz #1:
for on-Line Reading #1
Dr. Dave Dempsey
Dept. of Geosciences
SFSU, Spring 2012

This is a "preview" version of Pre-class Quiz #1, which is based on on-line Reading Assignment #1. The "preview" version is suitable for printing and leisurely inspection before you submit your answers to the the interactive or "live" version—that is, the real thing. When you feel ready to submit your answers, go to iLearn's METR 104 "Pre-class Quizzes" section, select the interactive version, and follow its instructions.

(Responses must be submitted by 12:05 p.m. Monday, Jan. 30. If you leave the interactive version before submitting your answers, be sure to save the answers that you have already entered first, or you'll lose them.)

Description: The five questions below address points made about the weather and the atmosphere in on-line Reading Assignment #1.

The Questions:

(1) Multiple Answer. Basic Elements of Weather. Weather can be defined as the state of the atmosphere at a particular location and time. Which of the items listed below are considered basic elements of weather? (Select all that apply—there might be more than one correct answer.)
  1. temperature
  2. altitude
  3. wind speed
  4. air pressure
  5. wind chill
  6. humidity
  7. cold fronts and warm fronts
  8. extent of cloud cover
  9. type of precipitation
  10. type(s) of clouds
  11. rate of accumulation of precipitation
  12. wind direction

(2) Multiple Choice. Composition of Dry Air. Air consists of a mixture of gases. What are the three most abundant gases in "dry" air, in order of decreasing abundance (i.e., the most abundant listed first)? ("Dry" air is air that we imagine has no water vapor in it.) (Pick the one correct answer.)

  1. nitrogen, oxygen, and argon
  2. oxygen, water vapor, and carbon dioxide
  3. carbon dioxide, methane, and ozone
  4. nitrogen, water vapor, and carbon dioxide

(3) Multiple Choice. Stratospheric Ozone. Most naturally occurring ozone is concentrated between about 10 and 50 kilometers (6 and 30 miles) above the earth's surface in a region of the atmosphere called the stratosphere. Which one of the following types of radiation does ozone in the stratosphere absorb the best? (Pick the one correct answer.)

  1. ultraviolet (UV) radiation
  2. visible light
  3. infrared (IR) radiation
  4. microwave radiation

(4) Multiple Answer. Aerosols. Aerosols play important roles in weather and climate. For example, they can act as tiny surfaces onto which water vapor can condense to form cloud droplets, and they can reduce the amount of sunlight reaching the surface of the earth by absorbing, reflecting, and scattering incoming solar energy. Of the items listed below, which one(s) are examples of aerosols? (Select all that apply—there might be more than one correct answer.)
  1. smoke and soot
  2. pollen
  3. chlorofluorocarbons (CFCs)
  4. salt left in the air when sea spray evaporates
  5. carbon dioxide (CO2)

(5) Multiple Answer. Human Impacts. What are some impacts that people have on the atmosphere? (Select all that apply—there might be more than one correct answer.)
  1. air pollution
  2. acid rain
  3. stratospheric ozone depletion
  4. global warming
  5. reduced biodiversity

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