Atmospheric Gases and Their Roles

The Earth's atmosphere consists mainly of nitrogen, oxygen, and trace gases like argon and carbon dioxide. Nitrogen is crucial for plant protein synthesis, while oxygen is vital for respiration and combustion. Argon is used in lighting, and carbon dioxide is a greenhouse gas essential for photosynthesis. Water vapor varies and is key to cloud formation. The atmosphere's composition changes due to natural and human activities, impacting climate and life. Protecting the atmosphere is crucial for future generations.

What percentage of Earth's atmosphere is made up of nitrogen?

• 78%

• 21%

• 1%

• 50%

Which gas is the most abundant in Earth's atmosphere?

• Oxygen

• Carbon Dioxide

• Nitrogen

• Argon

Why is nitrogen important for life on Earth?

• It traps heat in the atmosphere

• It is used in light bulbs

• It is used by plants to make proteins

• It is used by animals to breathe

What is the role of oxygen in the atmosphere?

• It is used by plants to make proteins

• It is essential for breathing

• It is used in light bulbs

• It is a greenhouse gas

Which gas is used in light bulbs and other gas-filled devices?

• Oxygen

• Carbon Dioxide

• Nitrogen

• Argon

What is the role of carbon dioxide in the atmosphere?

• It is used by animals to breathe

• It is a greenhouse gas that traps heat

• It is the most variable gas

• It is used in light bulbs

How variable is water vapor in the atmosphere?

• It is always 1%

• It varies from 0% to 4%

• It is always 78%

• It varies from 10% to 20%

What is the role of ozone in the atmosphere?

• It is essential for breathing

• It is used by plants to make proteins

• It protects Earth from ultraviolet radiation

• It is used in light bulbs

Which factor can affect the levels of gases in the atmosphere?

• The shape of clouds

• The color of the sky

• The speed of wind

• Volcanic eruptions

Why is it important to protect Earth's atmosphere?

• It is a source of water

• It helps to regulate our climate

• It is used in light bulbs

• It is a source of food