AV Weather CH.1 – Flashcards

The unit of pressure most commonly found on a surface weather map is a. inches of mercury (Hg). b. millibars or hectopascals. c. pounds per square inch. d. millimeters of mercury (Hg).

The gas that absorbs most of the harmful ultraviolet radiation in the stratosphere is a. water vapor. b. nitrous oxide. c. carbon dioxide. d. ozone.

The earth's atmosphere is divided into layers based on the vertical profile of a. air pressure. b. air temperature. c. air density. d. wind speed.

At the 500 mb level, the amount of oxygen inhaled in a single breath is ____ of that inhaled at sea-level. a. about the same b. about one-quarter c. about one-half d. about three-quarters

Which of the following is MOST likely associated with fair weather? a. high pressure area b. low pressure area c. a cold front d. a warm front

On a weather map, sharp changes in temperature, humidity, and wind direction are marked by a. a front. b. an anticyclone. c. a ridge. d. blowing dust.

In the middle latitudes of the Northern Hemisphere, surface winds tend to blow ____ and ____ around an area of surface low pressure. Select one: a. clockwise; inward b. clockwise; outward c. counterclockwise; inward d. counterclockwise; outward

The primary source of energy for the earth's atmosphere is Select one: a. energy from within the earth. b. the sun. c. erupting volcanoes. d. lightning discharges associated with thunderstorms.

Water vapor is Select one: a. a gas. b. a cloud droplet. c. a rain drop. d. a snowflake.

The greenhouse gases in the earth's atmosphere Select one: a. Are harmful gases that change ultraviolet radiation into harmful visible lightrays. b. Are being reduced to a dangerous level by CFCs. c. Provide a kind of "blanket" and reflect energy back to earth to warm the planet. d. Changes CO2 into Nitrogen which is used by plant life as a fertilizer.

Which of the following weather elements ALWAYS decreases as we climb upward in the atmosphere? Select one: a. wind b. temperature c. pressure d. moisture

Almost all of the earth's weather occurs in the Select one: a. stratosphere. b. mesosphere. c. thermosphere. d. troposphere.

In a temperature inversion a. air temperature increases with increasing height. b. air temperature decreases with increasing height. c. air temperature remains constant with increasing height. d. it is warmer at night than during the day

The rate at which temperature decreases with increasing altitude is known as the Select one: a. temperature slope. b. lapse rate. c. sounding. d. thermocline.