Front

What are trace gases?

Back

Trace gases are small amounts of gases in the atmosphere, such as water vapor, carbon dioxide, methane, nitrous oxide, and CFCs, which together make up only 0.1% of Earth's atmosphere.

Front

What human activity is likely to increase trace gases in the atmosphere?

Back

Utilizing fossil fuels to power factories, such as a shoe manufacturer, is likely to increase trace gases in the atmosphere.

Front

How do human activities affect greenhouse gas levels?

Back

Human activities are increasing the levels of greenhouse gases in the atmosphere.

Front

Which layer of the atmosphere contains the ozone?

Back

The stratosphere contains the ozone.

Front

How does deforestation affect the greenhouse effect?

Back

Deforestation increases the greenhouse effect because it leads to more carbon dioxide in the atmosphere, which absorbs infrared radiation.

Front

Which activity does NOT decrease CO2 emissions?

Back

Cutting trees in a large area to create land for a shopping mall does NOT decrease CO2 emissions.

Front

What is the greenhouse effect?

Back

The greenhouse effect is the warming of Earth's surface due to the trapping of heat by greenhouse gases in the atmosphere.

Front

Name a greenhouse gas that is increased by human activities.

Back

Carbon dioxide (CO2) is a greenhouse gas that is increased by human activities.

Front

What is the role of the stratosphere?

Back

The stratosphere contains the ozone layer, which protects Earth from harmful ultraviolet (UV) radiation.

Front

How does recycling impact greenhouse gas emissions?

Back

Recycling reduces greenhouse gas emissions by decreasing the need for new materials and energy consumption.