In the diagram, the thermometer held 2 meters above the floor shows a temperature of 30ºC. The thermometer on the floor shows a temperature of 24ºC. The diagram supports the concept that:

• hot air rises

• hot air sinks

• cold air rises

• warm and cold air suspend (stay in mid-air)

Which diagrams shows the direction that cool air flows during a sea breeze?

If the ozone layer disappeared, life on Earth would be exposed to _______concentrations of ultraviolet

• lower

• higher

• no change in

• none of the above

Which layer would we be able to see the Blizzard of 2010?

• troposphere

• stratosphere

• exposphere

• thermosphere

When Earth receives energy from the Sun, ____.

• some energy is reflected back into space

• some is absorbed by the atmosphere

• some is absorbed by land and water on Earth's surface

• all of the above

Not all areas on Earth's surface receive the same amount of radiation because Earth's surface ____.

• is flat

• is curved

• has continents

• is mostly water

Cold air has more molecules occupying a cubic centimeter of space than warm air; therefore, it has ____ pressure.

• higher

• lower

• the same

• half the

Air pressure is greatest _________ because there are more molecules of air pushing down from above.

• in the troposphere

• in the exosphere

• at the top of the mountain

• at sea level