Review Chapter 15: Earth’s Atmosphere

Front

What is a 'Catalytic converter'?

Back

A catalytic converter is a device in vehicles that reduces harmful emissions from the exhaust. (Memory aid: It converts bad gases into less harmful ones.)

Front

How do levels of industrial smog compare in developing nations with levels in developed nations?

Back

Levels of industrial smog are higher in developing nations than in developed nations.

Front

What is Air Pollution?

Back

Air pollution: The presence of harmful substances in the air that can negatively affect health and the environment. Memory aid: Polluted air makes it hard to breathe.

Front

What is 'relative humidity'?

Back

The relative humidity today is 60%, which means the air contains 60% of the maximum amount of water vapor it can hold at this temperature.

Front

What is the difference between primary and secondary air pollutants?

Back

Primary pollutants are emitted directly from sources, while secondary pollutants are formed in the atmosphere through chemical reactions.

Front

What are the main components of Earth's atmosphere?

Back

The main components of Earth's atmosphere are nitrogen (78%), oxygen (21%), and trace gases (1%).

Front

What is the greenhouse effect?

Back

The greenhouse effect is the process by which certain gases in Earth's atmosphere trap heat, keeping the planet warm.

Front

What are the effects of air pollution on human health?

Back

Air pollution can cause respiratory diseases, cardiovascular problems, and can worsen existing health conditions.

Front

What is ozone depletion?

Back

Ozone depletion refers to the reduction of the ozone layer in the stratosphere, primarily caused by chlorofluorocarbons (CFCs).

Front

What is the role of trees in air quality?

Back

Trees improve air quality by absorbing carbon dioxide and releasing oxygen, as well as filtering pollutants from the air.