Gr 9 NATURAL SCIENCES: CH 4.4 The thermosphere
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Questions and Answers

What is the approximate altitude range of the thermosphere?

  • 500 km to 2000 km
  • 80 km to 600 km (correct)
  • 20 km to 100 km
  • 100 km to 1000 km

    • What is the main reason for the extreme temperatures in the thermosphere?

  • Wind patterns
  • Earth's surface heat
  • Atmospheric pressure
  • Solar activity and radiation (correct)

    • What is the characteristic of the air density in the thermosphere?

  • No air density
  • High air density
  • Low air density (correct)
  • Variable air density

    • What is the approximate altitude of the International Space Station?

    <p>370 km (A)</p> Signup and view all the answers

    What is the function of the ionosphere in terms of radio waves?

    <p>Reflection of radio waves (B)</p> Signup and view all the answers

    What is the name of the phenomenon that occurs when solar wind particles interact with the ions in the ionosphere?

    <p>Aurora Phenomena (A)</p> Signup and view all the answers

    What is the name of the lights visible in the southern hemisphere?

    <p>Aurora Australis (C)</p> Signup and view all the answers

    What lies beyond the thermosphere?

    <p>The exosphere (B)</p> Signup and view all the answers

    What is the process that occurs in the ionosphere due to solar radiation?

    <p>Ionization (A)</p> Signup and view all the answers

    What is the temperature range of the thermosphere?

    <p>-90°C to 1500°C (A)</p> Signup and view all the answers

    Why do satellites in Low Earth Orbit (LEO) experience extremely low air resistance?

    <p>Because of the extremely low air density in the thermosphere (D)</p> Signup and view all the answers

    What is the primary source of heat for the thermosphere?

    <p>Solar activity (D)</p> Signup and view all the answers

    What would be the sensation of temperature in the thermosphere for a human?

    <p>Cold (C)</p> Signup and view all the answers

    What is the purpose of the ionosphere in terms of protecting the Earth?

    <p>To absorb harmful radiation (A)</p> Signup and view all the answers

    What is the location of the aurora borealis phenomenon?

    <p>In the northern hemisphere (D)</p> Signup and view all the answers

    What is the main characteristic of the thermosphere in terms of its altitude?

    <p>It has a variable altitude (A)</p> Signup and view all the answers

    What is the role of the ionosphere in radio communication?

    <p>It reflects longer wavelength radio waves (A)</p> Signup and view all the answers

    What is the relationship between the thermosphere and the exosphere?

    <p>The thermosphere gradually transitions into the exosphere (C)</p> Signup and view all the answers

    Why are auroras visible in the polar regions?

    <p>Because of the interaction between solar wind particles and the ions in the ionosphere (B)</p> Signup and view all the answers

    What is the main difference between the thermosphere and the exosphere?

    <p>The thermosphere is a distinct layer, while the exosphere is a gradual transition (C)</p> Signup and view all the answers

    What is the primary reason why the thermosphere's air density is extremely low?

    <p>It is constantly losing molecules to outer space (D)</p> Signup and view all the answers

    What is the function of the ionosphere in terms of UV and X-rays?

    <p>It absorbs harmful radiation (C)</p> Signup and view all the answers

    Why do satellites in Low Earth Orbit (LEO) experience minimal heat transfer from the thermosphere?

    <p>The thermosphere has a low air density (A)</p> Signup and view all the answers

    What is the characteristic of the temperature in the thermosphere?

    <p>It varies greatly due to solar activity (A)</p> Signup and view all the answers

    What is the relationship between the thermosphere and the ionosphere?

    <p>The ionosphere is a sublayer of the thermosphere (C)</p> Signup and view all the answers

    What is the result of the interaction between solar wind particles and the ions in the ionosphere?

    <p>The creation of the aurora phenomenon (C)</p> Signup and view all the answers

    What is the characteristic of the altitude range of the thermosphere?

    <p>It is variable and wide (C)</p> Signup and view all the answers

    What is the primary purpose of the ionosphere in terms of radio communication?

    <p>To reflect longer wavelength radio waves (D)</p> Signup and view all the answers

    Why do humans not feel the extreme temperatures in the thermosphere?

    <p>The thermosphere has a low air density (B)</p> Signup and view all the answers

    What is the transition beyond the thermosphere?

    <p>Into the exosphere and outer space (A)</p> Signup and view all the answers

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