Interactions in the atmosphere

1. Warm air rises as cold air sinks. Why?

• Warm air is less dense than cold air.

• Warm air has less mass than cold air.

• Warm air exerts less pressure than cold air.

• The average kinetic energy of the molecules in warm air is less.

2. What makes the Earth’s troposphere warm?

• greenhouse effect

• direct rays of sunlight

• surface of Earth

• ozone layer

3. Which statement is NOT TRUE about water vapor in the atmosphere?

• Water vapor is present in all layers of the atmosphere.

• Without water vapor, rainfalls are not possible.

• Water vapor regulates air temperature.

• Water vapor is an important component of the atmosphere.

4. What is/are the cause/s of heating in the lower part of the atmosphere?

• all of the above

• trapping of Earth’s radiation by some gases in the atmosphere

• radiation from Earth’s surface

• solar radiation

How much oxygen is present in the air?

• 21%

• 78%

• 1%

• 2.1%

Why is the land breeze observed at night?

• Air over land is cool, so it sinks, creating pressure differences.

• Air over the land is warm, so it rises, creating pressure differences.

• There is much water vapor over the land.

• The flow of air is not hindered.

Due to uneven heating, circulatory movement is set up in liquids and gases. What is this process called?

• convection

• conduction

• insolation

• radiation

Why is the troposphere called the weather sphere?

• Water vapor is found mostly in the troposphere.

• Temperature decreases as the altitude increases in the troposphere.

• There is a high concentration of ozone in this layer.

• The troposphere has the densest air.

A cold air mass comes in contact with the warm surface of Earth. What will happen to the air mass?

• It becomes warmer.

• It gets colder.

• Its density decreases.

• Its temperature remains the same.

What will happen to the air near a ground that becomes warmer?

• It rises.

• It sinks more.

• Its density increases.

• Its particles move closer.