A ratio that compares the amount of water vapor the air contains to the maximum amount that the air could hold at that temperature is

The lowest layer of Earth’s atmosphere, the one directly above the ground, is called the

What is the source of the energy that drives air movement in the troposphere and influences weather and climate?

Carbon-containing fuels, or fossil fuels, formed millions of years ago from the remains of

How does carbon monoxide affect human health?

A(n) _____ can trap smog close to the surface. It happens when a layer of cool, dense air stays near the ground and under a layer of warm air.

Normal precipitation has a pH of about 5.6. What pH might acid precipitation have?

Pollutants are removed or changed chemically before they leave factory smokestacks by a(n)

Ozone depletion was caused by the following chemicals, which were used in refrigerators and aerosol spray cans.

The air you breathe in from the atmosphere is made mostly of

How does the ozone layer benefit living things on Earth?

In which main layer of Earth’s atmosphere does most weather occur?

Radiation, conduction, and convection are the three main methods of

The boundary between air masses that differs in temperature and moisture is called a(n)

Substances, such as smoke and carbon monoxide, released into the air are called

What is the source of most air pollution?

How does carbon monoxide interfere with your body’s ability to deliver oxygen to cells?

What is the main source of pollutants in photochemical smog?

What atmospheric condition caused London’s “killer smog” of 1952 and regularly causes smog buildup in some cities, such as Los Angeles and Mexico City?

Which type of precipitation may contain acidic pollutants?

The pH scale is used to measure

Meteors are burned up in this layer of the atmosphere?

A device in a motor vehicle that reduces the amount of air pollutants in emissions is a(n)

The ozone hole was located primarily above

In general, warm air can hold less water vapor than cooler air.

The ozone layer is found within the troposphere.

Primary pollutants are produced when air pollutants react chemically with other substances.

Trace amounts of some air pollutants may contribute to cancer.

As a result of the Clean Air Act, today, gasoline used by cars and trucks in the United States contains very large quantities of lead.

Climate refers to atmospheric conditions over short time periods, typically hours or days, and within relatively small areas.

The transfer of heat (energy) through space is called conduction.

Industrial smog is a thick, brownish haze that forms when sunlight acts on certain air pollutants, such as nitrogen oxides and chemicals called hydrocarbons.

Acid deposition results when products of combustion combine with sunlight in the atmosphere.

Ozone is beneficial when it is in the troposphere.

____________________ is the force exerted by air on the area below it.

____________________ describes the pattern of atmospheric conditions in large geographic regions over long periods of time.

If you combine the words smoke and fog, you get the word ____________________.

The acids that form from pollution in the atmosphere then settle to the surface of Earth are called acid ____________________.

The term ____________________ was used to describe the area of lowered ozone concentration over Antarctica.

The ____________________ is the thin layer of gases that surrounds earth.

The____________________ is the second lowest layer of the atmosphere, as measured from Earth’s surface.

____________________ is the release of damaging materials into the atmosphere.

Harmful ____________________ conditions, such as asthma and bronchitis, have been linked to air pollutants.

In the United States, the ____________________, a law initially passed in 1963, protects and improves the quality of air in order to safeguard human health and the environment.