Earth Science ch. 19
Terms in this set (43)
The force exerted by the weight of the air above is called ____.
a. air pressure
Which of these instruments is NOT used to measure air pressure?
Standard sea level pressure in millibars is ____.
Who invented the mercury barometer?
What is the ultimate energy source for most wind?
c. solar radiation
Which force generates winds?
c. pressure differences
Which of the following is NOT a force that influences wind?
b. magnetic field
In Figure 19-1, the lines on the weather map that connect points of equal pressure are ____.
In Figure 19-1, closely spaced lines indicate ____.
a. high winds
A steep pressure gradient ____.
b. produces strong winds
Widely spaced isobars indicate ____.
c. light winds
Variations in air pressure from place to place are the principal cause of ____.
Fast-moving currents of air that occur above the friction layer are called ____.
d. jet streams
High-altitude, high-velocity "rivers" of air are called ____.
b. jet streams
The Coriolis effect influences ____.
b. wind direction
the deflection of wind due to the Coriolis effect is strongest at ____.
d. the poles
In the Northern Hemisphere, winds associated with a low-pressure system blow ____.
a. counterclockwise toward the center
In the Southern Hemisphere, winds associated with a low-pressure system blow ____.
a. clockwise toward the center
In the Northern Hemisphere, winds associated with a high-pressure system blow ____.
c. clockwise outward from the center
Centers of low pressure are called ____.
Air subsides in the center of a(n) ___
b. high-pressure system
Fair weather can usually be expected with the approach of which of the following?
High-pressure systems are usually associated with which of the following?
descending air, relatively dry conditions.
clear weather d. all of the above
The general movement of low-pressure centers across the United States is from ____.
c. west to east
Which of the following does NOT describe the surface air movement of a Northern Hemisphere low?
What is NOT true about lows that move across the United States?
b. Their paths are very predictable.
The net inward movement of air causes the area occupied by an air mass to shrink, a process known as ____.
b. horizontal convergence
Seasonal changes in wind direction associated with large landmasses and adjacent water bodies are called
Which surface winds blow between the subtropical high and the equator?
a. trade winds
The deserts of the Sahara and Australia are associated with the ____.
b. subtropical high
In the winter, large landmasses such as Asia develop a seasonal ____.
a. high-pressure system
Near the equator, rising air is associated with a pressure zone known as the ____.
b. equatorial low
If Earth did not rotate, how would air at the equator move?
b. Air would rise and move toward the poles
Valley and mountain breezes are examples of ____.
c. local winds
A sea breeze usually originates during the ____.
b. day and flows toward the land
A land breeze usually originates during the ____.
c. evening and flows toward the water
When is a sea breeze most intense?
a. during mid- to late afternoon
A wind that consistently blows more often from one direction than from any other is called a ____.
b. prevailing wind
Which instrument is used to measure wind speed?
Winds are labeled according to which of the following?
b. the direction from which they blow
Which phenomenon is associated with surface temperatures in the eastern Pacific that are colder than
a. La Niña
Which of the following is a warm countercurrent that periodically flows southward along the coasts of
Ecuador and Peru?
d. none of the above
Which of the following can be impacted by El Niño?
the fish industry. the farming industry
.climate d. all of the above