ST

How are the components of air related to the water cycle?

Water vapor in the air condenses and falls as rain.

Which of the following processes result from the release of sulfur compounds into the air?

acid rain

What gas is present in the greatest proportion within Earth's atmosphere?

nitrogen

Which of the following is the most abundant atmospheric component?

nitrogen

Which of the following is not a result of acid rain?

smog near Earth's surface

Which of the following results when sunlight combines with ground-level ozone?

smog

Why does air density decrease with increasing altitude within Earth's atmosphere?

Air density decreases with increasing altitude because the gravitational pull exerted by the Earth decreases with increasing altitude.

What is the relationship between altitude and air density within Earth's atmosphere?

As altitude increases, air density decreases.

Which of the following is a valid method for reducing the amount of greenhouse gases in the atmosphere?

Decrease the amount of fossil fuels burned by cars.

How would Earth be different without the presence of greenhouse gases within the atmosphere?

Earth would be much colder without greenhouse gases because greenhouse gases trap and reradiate heat energy back toward Earth.

Which of the following correctly describes the greenhouse effect?

Earth's atmosphere heats naturally when solar radiation is absorbed.

Which of the following is a valid example of how the greenhouse effect works in the atmosphere?

The temperature inside a car with the windows closed on a hot summer day is higher than the outside temperatures.

Which of the following is an example of a greenhouse gas?

carbon dioxide

Which of the following is an example of a natural change in atmospheric composition?

daily changes in the amount of water vapor in the air

What gas is necessary for humans to breathe? What percentage of Earth's atmosphere does this gas constitute?

oxygen, 21%

Which molecule within the atmosphere is responsible for blocking harmful UV radiation from the sun?

ozone

Which of the following atmospheric components is beneficial to humans at higher altitudes, but dangerous near ground level?

ozone

Which of the following is the only list representing natural components of the atmosphere?

pollen, oxygen, and carbon dioxide

Within which atmospheric layer is the highest concentration of ozone found?

the stratosphere

Within which atmospheric layer(s) does temperature increase with increasing altitude?

the stratosphere and the thermosphere

Within which atmospheric layer do most weather events occur?

the troposphere

List the layers of Earth's atmosphere in order of increasing altitude.

troposphere, stratosphere, mesosphere, thermosphere, exosphere

Which of the following was responsible for the buildup of carbon dioxide, ammonia, and water vapor in Earth's early atmosphere?

volcanoes