Gr 9 NATURAL SCIENCES: CH 4.4 The greenhouse effect
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Questions and Answers

What is the primary function of greenhouse gases in the Earth's atmosphere?

  • To reflect sunlight away from the Earth's surface
  • To create a vacuum in the atmosphere
  • To cool the Earth's surface by emitting cold air
  • To absorb and re-emit infrared radiation, warming the Earth's surface (correct)

    • Which of the following is NOT a source of carbon dioxide (CO₂)?

  • Industrial processes
  • Combustion of fossil fuels
  • Evaporation of water on Earth's surface (correct)
  • Respiration

    • What is the result of the extreme greenhouse effect on Venus?

  • Very low surface temperatures
  • High surface temperatures (correct)
  • No atmosphere at all
  • A balanced atmosphere with a moderate temperature

    • What is the primary component of the Earth's atmosphere?

    <p>Nitrogen (78.08%)</p> Signup and view all the answers

    What is the main reason why the Earth's surface is not too cold to support life?

    <p>The greenhouse effect</p> Signup and view all the answers

    What is the primary source of methane (CH₄)?

    <p>Decomposition of organic matter</p> Signup and view all the answers

    What is the result of the little greenhouse effect on Mars?

    <p>Cold surface temperatures</p> Signup and view all the answers

    What is the main effect of the greenhouse gases on Earth's climate?

    <p>To maintain a moderate climate suitable for life</p> Signup and view all the answers

    What is the main cause of global warming?

    <p>Increase in the levels of greenhouse gases</p> Signup and view all the answers

    What is climate change?

    <p>Long-term changes in temperature, precipitation, and other atmospheric conditions</p> Signup and view all the answers

    What is the main consequence of melting polar ice?

    <p>Rise in sea levels and flooding of low-lying areas</p> Signup and view all the answers

    What is the main impact of altered weather patterns on agriculture?

    <p>Decrease in crop yields</p> Signup and view all the answers

    What is the main consequence of long-term climate change on biodiversity?

    <p>Increase in species extinction</p> Signup and view all the answers

    What is the main method used by scientists to track CO₂ levels over thousands of years?

    <p>Ice core samples, historical climate data, and current atmospheric measurements</p> Signup and view all the answers

    What is the main conclusion of investigating CO₂ levels?

    <p>Understanding the greenhouse effect and human impact on greenhouse gas levels is crucial for addressing global warming and mitigating climate change</p> Signup and view all the answers

    What is the primary difference between the greenhouse effect on Venus and Mars?

    <p>The thickness of the atmosphere</p> Signup and view all the answers

    What is the role of water vapour in the greenhouse effect?

    <p>It absorbs and re-emits infrared radiation</p> Signup and view all the answers

    What is the effect of the greenhouse effect on the Earth's surface temperature?

    <p>It warms the surface temperature</p> Signup and view all the answers

    What would be the consequence of the Earth's atmosphere having no greenhouse gases?

    <p>The Earth would be too cold to support life</p> Signup and view all the answers

    What is the primary component of the atmospheres on Mars and Venus?

    <p>Carbon dioxide</p> Signup and view all the answers

    What is the sequence of events in the greenhouse effect?

    <p>Sun's radiation, absorption, infrared radiation</p> Signup and view all the answers

    Why is the Earth's atmosphere able to support life?

    <p>Due to the balance of greenhouse gases</p> Signup and view all the answers

    What is the primary cause of the increase in Earth's average surface temperature?

    <p>Rising levels of greenhouse gases</p> Signup and view all the answers

    Which human activity has significantly contributed to the increase in CO₂ levels?

    <p>Burning of fossil fuels</p> Signup and view all the answers

    What is the consequence of melting polar ice on low-lying areas?

    <p>Flooding and coastal erosion</p> Signup and view all the answers

    What is the impact of altered weather patterns on food production?

    <p>Decreased crop yields and food production</p> Signup and view all the answers

    What is the long-term consequence of climate change on biodiversity?

    <p>Increased extinction rates</p> Signup and view all the answers

    What is the purpose of using ice core samples in climate research?

    <p>To track CO₂ levels over thousands of years</p> Signup and view all the answers

    What is the significance of understanding the greenhouse effect and human impact on greenhouse gas levels?

    <p>To mitigate the effects of global warming and climate change</p> Signup and view all the answers

    What is the primary goal of investigating CO₂ levels?

    <p>To determine the impact of human activities on CO₂ levels</p> Signup and view all the answers

    What is the primary difference between global warming and climate change?

    <p>Global warming refers to the increase in Earth's average surface temperature, while climate change refers to long-term changes in atmospheric conditions</p> Signup and view all the answers

    Which human activity has contributed the most to the increase in CO₂ levels since the industrial revolution?

    <p>Burning of fossil fuels</p> Signup and view all the answers

    What is the primary reason why scientists investigate CO₂ levels over thousands of years?

    <p>To determine the impact of human activities on CO₂ levels</p> Signup and view all the answers

    What is the consequence of altered weather patterns on crop yields?

    <p>Decreased crop yields due to changed precipitation patterns</p> Signup and view all the answers

    What is the primary consequence of long-term climate change on biodiversity?

    <p>Extinction of species unable to adapt</p> Signup and view all the answers

    What is the primary role of the greenhouse effect in maintaining a moderate climate?

    <p>Regulating Earth's average surface temperature</p> Signup and view all the answers

    What is the primary evidence used to support the idea that human activities are contributing to global warming?

    <p>Ice core samples and historical climate data</p> Signup and view all the answers

    What is the primary goal of addressing global warming and climate change?

    <p>To maintain a moderate climate suitable for life</p> Signup and view all the answers

    Which of the following processes does NOT contribute to the formation of methane (CH₄) in the atmosphere?

    <p>Combustion of fossil fuels</p> Signup and view all the answers

    What is the primary reason why the Earth's surface temperature is not as cold as Mars?

    <p>The Earth's atmosphere has a balanced mix of greenhouse gases</p> Signup and view all the answers

    What is the main difference between the Earth's atmosphere and that of Venus?

    <p>The Earth's atmosphere has a balanced mix of greenhouse gases, while Venus' atmosphere is mostly CO₂</p> Signup and view all the answers

    What would be the consequence of the Earth's atmosphere having no greenhouse gases?

    <p>The Earth's surface temperature would be extremely cold</p> Signup and view all the answers

    What is the primary role of infrared radiation in the greenhouse effect?

    <p>It is absorbed and re-emitted by greenhouse gases</p> Signup and view all the answers

    What is the main similarity between the Earth's atmosphere and that of Mars?

    <p>Both have a thin atmosphere</p> Signup and view all the answers

    What is the primary difference between the Earth's surface temperature and that of Venus?

    <p>The Earth's surface temperature is lower than Venus'</p> Signup and view all the answers

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