15-3

What causes differences in air pressure?

• even heating of the Earth

• even cooling of the Earth

• unequal heating of the Earth

• increased heating of the EArth

The movement of the air caused by differences in air pressure is called

• dense air

• wind

• polar air

• vents

Air is warmer and less dense than surrounding air at the equator because the equator receives more

• wind

• air pressure

• solar energy

• radiation

Because air at the poles is colder and denser than surrounding air, it

• rises

• sinks

• circulates

• stagnates

After high pressure areas are created around the poles, cold polar air flows toward

• the equator

• the north pole

• the south pole

• the atmosphere

Which of the following are local winds?

• mountain breezes

• convection cells

• polar winds

• westerlies

What causes wind?

• differences in air pressure

• differences in gravity

• differences in oxygen

• differences in the thermosphere

What causes differences in air pressure around the Earth?

• warm air rises at the equator, and cold air sinks at the poles

• warm air sinks at the equator, and cold air rises at the poles

• warm air rises at eh equator and cold air rises at the poles

• cold air rises at the equator, and warm air sinks at the poles

Air moves in large, circular patterns called

• pressure belts

• convection currents

• convection cells

• trade winds

Why does warm air rise and cold air sink?

• because warm air is less dense than cold air

• because warm air is denser than cold air

• because cold air is less dense than warm air

• because warm air has less pressure than cold air does