Gr 8 Natural Sciences Ch 4.1: Earth's position in the solar system
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Questions and Answers

What is the average distance between the Earth and the Sun?

  • 250 million kilometers
  • 200 million kilometers
  • 100 million kilometers
  • 150 million kilometers (correct)

    • What is the primary purpose of maintaining moderate temperatures on Earth?

  • To generate strong winds
  • To create a habitat for dinosaurs
  • To maintain liquid water, essential for life (correct)
  • To support the formation of mountains

    • What is the primary reason Earth is able to support life?

  • Its average temperature is 15°C
  • Its unique position in the habitable zone (correct)
  • Its proximity to the Sun
  • Its atmosphere is rich in oxygen

    • Which gas is required for respiration by most living organisms?

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

    What is the main consequence of human activities such as burning fossil fuels and deforestation?

    <p>An increase in the concentration of greenhouse gases</p> Signup and view all the answers

    What is the process by which plants produce food?

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

    What is the range of distances from the Sun where liquid water can exist on a planet's surface?

    <p>0.8 to 1.4 AU</p> Signup and view all the answers

    What is the term used to describe the process of simple bacteria producing oxygen through photosynthesis?

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

    What is the estimated time when life on Earth began?

    <p>3.5 billion years ago</p> Signup and view all the answers

    Why is Venus unable to support life?

    <p>It is too close to the Sun</p> Signup and view all the answers

    What is essential for the process of photosynthesis?

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

    What is the result of an unchecked greenhouse effect on a planet, as seen in Venus?

    <p>An extreme increase in temperature</p> Signup and view all the answers

    What is the primary difference between Earth's atmosphere and Mars' atmosphere?

    <p>Earth's atmosphere is mostly oxygen, while Mars' is mostly carbon dioxide</p> Signup and view all the answers

    What is the average temperature of Mars?

    <p>-63°C</p> Signup and view all the answers

    What is the primary reason Earth is located in the habitable zone of the solar system?

    <p>It has liquid water on its surface.</p> Signup and view all the answers

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

    <p>Earth's atmosphere has a balanced greenhouse effect, while Venus' has a strong greenhouse effect.</p> Signup and view all the answers

    What is the significance of Earth being at a distance of 1 AU from the Sun?

    <p>It allows for liquid water to exist on the surface.</p> Signup and view all the answers

    What is the primary requirement for photosynthesis to occur?

    <p>Sunlight.</p> Signup and view all the answers

    Why is Mars unable to support life?

    <p>It is too far from the Sun, resulting in freezing temperatures.</p> Signup and view all the answers

    What is the term used to describe the region around a star where conditions are suitable for life?

    <p>Habitable zone.</p> Signup and view all the answers

    What is the primary consequence of a planet being too close to the Sun?

    <p>Extreme heat leads to the absence of liquid water.</p> Signup and view all the answers

    What is the primary condition necessary for a planet to support life?

    <p>The presence of liquid water on the surface.</p> Signup and view all the answers

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

    <p>To trap heat and keep the planet warm enough to support life</p> Signup and view all the answers

    What is the primary reason for the accumulation of oxygen in the oceans and atmosphere?

    <p>The production of oxygen through photosynthesis by early life forms</p> Signup and view all the answers

    What is the term used to describe the increase in Earth's average temperature due to human activities?

    <p>Global warming</p> Signup and view all the answers

    What is the result of a runaway greenhouse effect, as seen in Venus?

    <p>A planet with extreme temperatures</p> Signup and view all the answers

    What is the approximate time when life on Earth is estimated to have begun?

    <p>3.5 billion years ago</p> Signup and view all the answers

    What is the characteristic of the early life forms on Earth?

    <p>They were simple and thrived in an atmosphere with almost no oxygen</p> Signup and view all the answers

    What is the primary role of oxygen in the context of life on Earth?

    <p>To support respiration in most living organisms</p> Signup and view all the answers

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

    <p>The increase in the concentration of greenhouse gases</p> Signup and view all the answers

    What is the significance of the example of Venus in the context of the greenhouse effect?

    <p>It demonstrates the effects of an unchecked greenhouse effect</p> Signup and view all the answers

    What is the primary requirement for the existence of liquid water on a planet?

    <p>Moderate temperatures</p> Signup and view all the answers

    What is the primary role of early life forms on Earth?

    <p>To produce oxygen through photosynthesis</p> Signup and view all the answers

    What is the primary consequence of the accumulation of oxygen in the oceans and atmosphere?

    <p>The development of more complex life forms</p> Signup and view all the answers

    Which planet's atmosphere is primarily responsible for its extreme heat?

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

    What is the approximate distance range from the Sun where liquid water can exist on a planet's surface?

    <p>0.8 to 1.4 AU</p> Signup and view all the answers

    Which of the following planets has conditions that make it suitable for photosynthesis?

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

    What is the primary reason Mars is unable to support life?

    <p>Freezing temperatures</p> Signup and view all the answers

    Which of the following is NOT a condition necessary for a planet to support life?

    <p>Extreme heat</p> Signup and view all the answers

    What is the result of being too close to the Sun in the habitable zone?

    <p>Extreme heat</p> Signup and view all the answers

    Which planet has an atmosphere with a balanced greenhouse effect, allowing for moderate temperatures?

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

    What is the likely outcome if the concentration of greenhouse gases in Earth's atmosphere continues to increase unchecked?

    <p>A rapid increase in Earth's average temperature, leading to severe climate changes</p> Signup and view all the answers

    What is the primary factor that distinguishes Earth's atmosphere from those of its neighboring planets?

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

    What is the likely effect of deforestation on the Earth's atmosphere?

    <p>An increase in the concentration of carbon dioxide</p> Signup and view all the answers

    What is the primary role of early life forms on Earth?

    <p>To produce oxygen through photosynthesis</p> Signup and view all the answers

    What is the primary consequence of the accumulation of oxygen in the oceans and atmosphere?

    <p>The emergence of complex life forms</p> Signup and view all the answers

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