Understanding the Ozone Layer

The Earth's atmosphere is crucial for life, protecting us from harmful solar radiation and regulating temperature. The ozone layer, located in the stratosphere, absorbs most of the Sun's harmful ultraviolet rays. However, human activities have led to ozone depletion, primarily due to chemicals like CFCs. This depletion increases health risks and affects ecosystems. Efforts to reduce ozone-depleting substances have shown progress, with the ozone layer expected to recover by 2075 if current measures continue.

What is the primary role of Earth's atmosphere?

• To support plant growth

• To protect us from harmful radiations of the Sun

• To regulate ocean currents

• To provide oxygen for breathing

In which layer of the Earth's atmosphere is the ozone layer located?

• Thermosphere

• Troposphere

• Stratosphere

• Mesosphere

What is the chemical formula of ozone?

• O3

• H2O

• CO2

• O2

What percentage of harmful ultraviolet rays does the ozone layer absorb?

• 100%

• 98%

• 75%

• 50%

Which of the following is NOT a harmful effect of ultraviolet radiation?

• Improved vision

• Weak immune system

• Skin cancer

• Blindness

What are chlorofluorocarbons (CFCs) composed of?

• Chlorine, Fluorine, and Carbon

• Sulfur, Nitrogen, and Oxygen

• Hydrogen, Oxygen, and Nitrogen

• Carbon, Hydrogen, and Oxygen

What happens when a chlorofluorocarbon molecule is released into the atmosphere?

• It forms a new ozone molecule

• It becomes inert

• It reacts with water vapor

• It breaks up and releases a chlorine atom

What is the result of the reaction between chlorine monoxide and another ozone molecule?

• Formation of water

• Production of another chlorine atom

• Creation of carbon dioxide

• Generation of nitrogen oxide

What was the reported reduction of the ozone layer above Antarctica in the 1980s?

• 60%

• 80%

• 70%

• 50%

By what year is the ozone layer expected to return to pre-1980s levels if current measures continue?

• 2080

• 2075

• 2060

• 2050