Sea breezes are used to introduce one of the reasons why pressure gradients form, because they show a pretty

simple system. During the day over land (think inland Los Angeles), the ground heats up, and the land then heats the atmosphere. This all produces ________ air pressure over land, compared to the _________ air pressure over the oceans. 

top; bottom

lower; higher

down; up

higher; lower QUESTION 2

First, wind tries to blow from higher to lower pressure along a pressure gradient. Then, the coriolis effect deflects the wind. For winds blowing within about 5000 feet of Earth’s surface, the friction exerted by the Earth comes into play. What effect does this friction have on wind direction? 

Winds flow parallel to the isobars.

Wind reverses direction 180 degrees.

Winds do cross the isobars, flowing at an angle, from areas of higher to lower pressure.

Winds do cross the isobars, flowing at an angle, from areas of lower to higher pressure. QUESTION 3

A ______ pressure gradient produces strong winds, but a __________ pressure gradient produces low wind speeds.

little; big

isobars far part; isobars closer together

weak; strong

strong; weak QUESTION 4

How does air pressure change with altitude?

Air pressure first increases and then decreases with higher altitude

Air pressure first decreases and then increases with higher altitude.

Air pressure decreases with higher altitude

Air pressure increases with higher altitude.

QUESTION 5

What is air pressure?

The weight of the entire column of air above an area. The standard air pressure at sea level is 14.7 pounds per square inch. 14.7 pounds per square inch is equivalent to 1 bar or 1000 millibars of pressure.

The composition of the entire column of area above an area.

The amount of water vapor in the troposphere above an area.

The temperature above a square foot of land.

 

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