Evolution of Earth
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Questions and Answers

What has been responsible for the careful removal of CO2 from the atmosphere over billions of years?

  • The sun's luminosity
  • The Earth's axis inclination
  • Oil, natural gas, and coal formations (correct)
  • Natural cycles in the Earth's climate
  • What has caused the increased concentration of CO2 in the atmosphere, leading to global warming?

  • Humans digging up and burning carbon sources (correct)
  • The Earth's axis inclination
  • The sun's luminosity
  • Natural cycles in the Earth's climate
  • What has recent evidence conclusively shown about the levels of CO2 added to the atmosphere since 1800?

  • They have been due to changes in the Earth's axis inclination
  • They have been almost entirely due to human pollution (correct)
  • They have been due to changes in the sun's luminosity
  • They have been due to natural cycles in the Earth's climate
  • What has the Earth's climate been doing for the majority of the last 1,000 years, according to the text?

    <p>Cooling</p> Signup and view all the answers

    What has reversed the Earth's cooling trend of the last 1,000 years, according to the text?

    <p>Human intervention, mainly in the 20th century</p> Signup and view all the answers

    What is the main purpose of the ozone layer mentioned in the text?

    <p>To block harmful ultraviolet (UV) rays from space</p> Signup and view all the answers

    How is ozone (O3) formed in the Earth's atmosphere according to the text?

    <p>By combining two oxygen atoms</p> Signup and view all the answers

    What is the primary role of carbon dioxide in relation to global warming, as explained in the text?

    <p>It traps infrared radiation, contributing to the greenhouse effect</p> Signup and view all the answers

    What is one of the primary reasons for the destruction of the protective ozone layer mentioned in the text?

    <p>Chlorofluorocarbons released by human activities</p> Signup and view all the answers

    Why is oxygen (O2) essential for the formation of the ozone layer according to the text?

    <p>To split into single oxygen atoms when exposed to UV rays</p> Signup and view all the answers

    What was the nature of Earth's atmosphere billions of years ago?

    <p>Filled with rich amounts of carbon dioxide, nitrogen, and water vapor</p> Signup and view all the answers

    What process helped remove the excessive levels of carbon dioxide from the ancient Earth's atmosphere?

    <p>Dissolution of carbon dioxide in water and formation of limestone</p> Signup and view all the answers

    What was a major difference between the ancient Earth and the Earth we know today?

    <p>The ancient Earth was inhospitable and deadly</p> Signup and view all the answers

    What was a key factor that led to the change in Earth's atmosphere over time?

    <p>Reduction in volcanic activity</p> Signup and view all the answers

    What was a key factor that led to the change in Earth's atmosphere over time?

    <p>The appearance of photosynthetic plants in large numbers</p> Signup and view all the answers

    How did the ancient Earth's atmosphere differ from the Earth's atmosphere today?

    <p>It contained more carbon dioxide and less oxygen</p> Signup and view all the answers

    What process helped remove the excessive levels of carbon dioxide from the ancient Earth's atmosphere?

    <p>Both (b) and (c)</p> Signup and view all the answers

    What was a major difference between the ancient Earth and the Earth we know today?

    <p>The ancient Earth had higher levels of radiation</p> Signup and view all the answers

    What has been responsible for the careful removal of CO2 from the atmosphere over billions of years?

    <p>The formation of limestone in the oceans</p> Signup and view all the answers

    What happens when the sun's ultraviolet radiation reaches the Earth's surface?

    <p>It is reflected back into space.</p> Signup and view all the answers

    What is the main function of the ozone layer in the Earth's atmosphere?

    <p>To block ultraviolet rays</p> Signup and view all the answers

    How do chlorofluorocarbons contribute to the destruction of the ozone layer?

    <p>By reverting ozone back into oxygen</p> Signup and view all the answers

    What would happen if there was no greenhouse effect on Earth?

    <p>The Earth would be significantly warmer.</p> Signup and view all the answers

    How does carbon dioxide contribute to global warming?

    <p>By absorbing infrared radiation</p> Signup and view all the answers

    What has been the primary cause of the increased concentration of CO2 in the atmosphere leading to global warming?

    <p>Human pollution and the burning of carbon sources</p> Signup and view all the answers

    What does the text indicate has been the trend in the Earth's climate for the majority of the last 1,000 years?

    <p>Cooling</p> Signup and view all the answers

    What has been the primary process responsible for the careful removal of CO2 from the Earth's atmosphere over billions of years?

    <p>Storage in oil, natural gas, and coal deposits</p> Signup and view all the answers

    What does the text suggest has been the primary role of CO2 in relation to global warming?

    <p>CO2 absorbs heat from the sun, causing the greenhouse effect</p> Signup and view all the answers

    What has the text indicated is the primary reason for the reversal of the Earth's cooling trend over the last 1,000 years?

    <p>Human intervention and pollution, mainly in the 20th century</p> Signup and view all the answers

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