Front

What is the water cycle?

Back

The water cycle is the continuous process by which water moves through the environment, changing forms as it travels from one reservoir (like oceans, rivers, and lakes) to another.

Front

What substance contributed to ozone depletion?

Back

Chlorofluorocarbons (CFCs) are substances that contributed to the depletion of the ozone layer.

Front

How can a renewable resource become nonrenewable?

Back

A renewable resource can become nonrenewable through overuse or very high rates of use, leading to depletion.

Front

Why is a clean environment important for human health?

Back

A clean environment is critical for human health as it reduces exposure to pollutants and diseases.

Front

What is the air pollution situation in Mexico City?

Back

Students are learning about the negative effects of air pollution, indicating awareness of the pollution issues in Mexico City.

Front

How do plants use nitrogen?

Back

Plants absorb nitrogen from the soil, which is converted by certain bacteria into a form they can use.

Front

How do animals obtain nitrogen?

Back

Animals obtain nitrogen by eating plants that have absorbed nitrogen from the soil.

Front

What role do bacteria play in the nitrogen cycle?

Back

Certain bacteria convert atmospheric nitrogen into forms that plants can use, facilitating the nitrogen cycle.

Front

What is the significance of the ozone layer?

Back

The ozone layer protects the Earth from harmful ultraviolet (UV) radiation from the sun.

Front

What are chlorofluorocarbons (CFCs)?

Back

CFCs are man-made compounds that were commonly used in refrigeration and aerosol propellants, contributing to ozone depletion.