Unit 9: The Atmosphere (Grade 5)

What are the main gases found in the Earth's atmosphere?

• argon, radon, and xenon

• carbon dioxide, helium, and neon

• nitrogen, oxygen, and argon

• hydrogen, methane, and krypton

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

• Nitrogen

• Oxygen

• Carbon Dioxide

• Helium

What is the second most abundant gas in the Earth's atmosphere?

• helium

• carbon dioxide

• nitrogen

• oxygen

What is the percentage of oxygen in the Earth's atmosphere?

• 50%

• 10%

• 30%

• 21%

What is the percentage of nitrogen in the Earth's atmosphere?

• 90%

• 78%

• 50%

• 30%

What are the trace gases found in the Earth's atmosphere?

• Carbon monoxide, sulfur dioxide, nitrogen dioxide, ammonia, and radon

• Helium, nitrogen, argon, krypton, and xenon

• Carbon dioxide, methane, nitrous oxide, ozone, and water vapor

• Oxygen, hydrogen, helium, nitrogen, and argon

How does the composition of the atmosphere change with altitude?

• The composition of the atmosphere remains the same at all altitudes

• The composition of the atmosphere changes with an increase in the concentration of gases such as oxygen and nitrogen

• The composition of the atmosphere changes with a decrease in the concentration of gases such as oxygen and nitrogen.

• The composition of the atmosphere changes with the addition of new gases at higher altitudes

What is the role of carbon dioxide in the Earth's atmosphere?

• It helps cool down the Earth's atmosphere

• It has no role in the Earth's atmosphere

• It helps trap heat in the Earth's atmosphere

• It causes the Earth's atmosphere to expand

How does the composition of the atmosphere affect the greenhouse effect?

• The speed of wind in the atmosphere

• The number of clouds in the atmosphere

• The color of the sky

• The concentration of greenhouse gases in the atmosphere

Why is the composition of the atmosphere important for life on Earth?

• It has no impact on life on Earth

• It is only important for the growth of plants

• It provides the necessary gases for respiration and photosynthesis, regulates the temperature, and protects from harmful solar radiation.

• It causes extreme weather conditions