Understanding Climate Change and Global Warming
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Questions and Answers

According to the passage, which of the following statements is true?

  • The rate of global temperature increase has accelerated in recent decades. (correct)
  • The amount of carbon dioxide in the atmosphere has no impact on global temperatures.
  • The Earth's temperature has remained constant over the past century.
  • Global temperature changes are occurring at a slower rate than in Earth's past.

    • What is the primary reason given in the passage for the observed increase in global temperatures?

  • Changes in the Earth's orbit and tilt, altering the amount of solar radiation received.
  • A decrease in the Earth's reflectivity, causing it to absorb more heat from the sun.
  • Increased levels of carbon dioxide in the atmosphere, which traps heat from Earth's surface. (correct)
  • Depletion of the ozone layer, allowing more harmful radiation to reach Earth's surface.

    • What is the significance of the statement "Eleven of the last twelve years have been the warmest on record"?

  • It highlights the unprecedented nature of recent global temperature increases. (correct)
  • It implies that the Earth's temperature fluctuates in a cyclical pattern.
  • It indicates that the Earth's temperature is approaching its maximum possible limit.
  • It suggests that global temperatures have been relatively stable in recent years.

    • According to the passage, how do scientists study Earth's past temperature and carbon dioxide levels?

    <p>By studying the chemical composition of ice cores.</p> Signup and view all the answers

    Which of the following statements is NOT supported by the information in the passage?

    <p>The observed temperature increases are directly linked to human activities.</p> Signup and view all the answers

    Based on the information in the passage, what can be inferred about the relationship between carbon dioxide levels and global temperatures?

    <p>There is a positive feedback loop between carbon dioxide levels and global temperatures.</p> Signup and view all the answers

    What are the primary sources that scientists use to study Earth's climate history?

    <p>Ice cores, sediment cores, tree rings, and rock layers</p> Signup and view all the answers

    What do scientists learn from studying the bubbles in ice core layers?

    <p>The amount of carbon dioxide (CO₂) present in the atmosphere for each year</p> Signup and view all the answers

    How do scientists determine the temperatures for each year from ice cores?

    <p>By analyzing the isotopic ratios of oxygen atoms in the water molecules</p> Signup and view all the answers

    What happens when scientists' findings from different sources disagree about Earth's climate history?

    <p>They conduct further research to identify and resolve the discrepancies</p> Signup and view all the answers

    Why are glaciers considered a form of melting, shrinking ice?

    <p>Glaciers are frozen rivers that flow very slowly, and they have been speeding up lately</p> Signup and view all the answers

    What is the primary reason for the observed melting and shrinking of Arctic sea ice and glaciers?

    <p>Rising global temperatures due to climate change</p> Signup and view all the answers

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