Understanding the Greenhouse Effect

Which of the following gases is considered a major greenhouse gas in Earth's atmosphere?

• Oxygen

• Carbon dioxide

• Nitrogen

• Argon

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What is the primary cause of the greenhouse effect on Earth?

• Absorption of sunlight by the ocean

• Trapping of heat by certain gases in the atmosphere

• Reflection of sunlight by ice caps

• Movement of tectonic plates

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Which of the following is an effect of the greenhouse effect on global temperatures?

• Decrease in average global temperatures

• Increase in average global temperatures

• No change in global temperatures

• Sudden freezing of the atmosphere

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Explain how the increase in greenhouse gases can affect the melting of polar ice caps.

• Increased greenhouse gases cool the polar regions, preserving ice

• Increased greenhouse gases trap more heat, raising temperatures and causing ice to melt

• Greenhouse gases have no effect on polar ice caps

• Greenhouse gases directly freeze water

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Which of the following best describes the role of greenhouse gases in Earth's energy balance?

• They reflect all incoming solar radiation back to space

• They absorb and re-emit heat energy, warming the atmosphere

• They block sunlight from reaching Earth's surface

• They have no effect on Earth's temperature

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If the concentration of carbon dioxide in the atmosphere continues to rise, what is the most likely long-term effect on Earth's climate?

• Global temperatures will decrease

• Global temperatures will remain unchanged

• Global temperatures will increase

• The climate will become more stable

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A scientist observes that over the past 50 years, the average global temperature has increased. Using your knowledge of the greenhouse effect, what evidence could support the claim that greenhouse gases are responsible for this change?

• The amount of oxygen in the atmosphere has increased

• The concentration of greenhouse gases like carbon dioxide and methane has increased during the same period

• The number of volcanic eruptions has decreased

• The Earth's orbit has changed significantly

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Suppose a country reduces its emissions of greenhouse gases by 50%. Predict and explain the potential impact this could have on global temperatures over the next few decades.

• It would immediately stop all global warming

• It could slow the rate of global temperature increase, but not stop it entirely

• It would cause global temperatures to decrease rapidly

• It would have no effect on global temperatures

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(a)   energy can easily pass through greenhouse gases.

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(a)   energy gets absorbed by greenhouse gases.

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