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 (COâ‚‚)?

  • 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%) (C)</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 (A)</p> Signup and view all the answers

What is the primary source of methane (CHâ‚„)?

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

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

<p>Cold surface temperatures (A)</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 (D)</p> Signup and view all the answers

What is the main cause of global warming?

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

What is climate change?

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

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

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

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

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

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

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

What is the main conclusion of investigating COâ‚‚ levels?

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

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

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

What is the sequence of events in the greenhouse effect?

<p>Sun's radiation, absorption, infrared radiation (A)</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 (D)</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 (B)</p> Signup and view all the answers

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

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

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

<p>Flooding and coastal erosion (B)</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 (C)</p> Signup and view all the answers

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

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

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

<p>To track COâ‚‚ levels over thousands of years (D)</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 (C)</p> Signup and view all the answers

What is the primary goal of investigating COâ‚‚ levels?

<p>To determine the impact of human activities on COâ‚‚ levels (D)</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 (C)</p> Signup and view all the answers

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

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

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

<p>To determine the impact of human activities on COâ‚‚ levels (D)</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 (C)</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 (D)</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 (C)</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 (B)</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 (B)</p> Signup and view all the answers

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

<p>Combustion of fossil fuels (B)</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 (D)</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 COâ‚‚ (B)</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 (C)</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 (C)</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 (C)</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' (C)</p> Signup and view all the answers

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