Gr 9 NATURAL SCIENCES: CH 4.4 What is the atmosphere?
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Questions and Answers

What percentage of the atmosphere is composed of oxygen?

  • 20.95% (correct)
  • 21.05%
  • 20.05%
  • 22.05%
  • What is the primary factor affecting the distribution of gas molecules in the atmosphere?

  • Gravity (correct)
  • Humidity
  • Wind speed
  • Temperature
  • Which layer of the atmosphere is responsible for weather?

  • Troposphere (correct)
  • Stratosphere
  • Mesosphere
  • Thermosphere
  • What is the approximate altitude of the troposphere?

    <p>Up to about 12 km</p> Signup and view all the answers

    What is the characteristic of the temperature in the troposphere?

    <p>Decreases with altitude</p> Signup and view all the answers

    How do the number of gas molecules change with an increase in altitude?

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

    What is the layer above the thermosphere?

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

    What is the primary function of the ozone layer in the stratosphere?

    <p>To absorb and scatter ultraviolet radiation</p> Signup and view all the answers

    In which layer of the atmosphere do meteors typically burn up?

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

    What is the characteristic of the temperature gradient in the stratosphere?

    <p>It increases with altitude</p> Signup and view all the answers

    What is the primary feature of the exosphere?

    <p>It is a transition zone between Earth's atmosphere and outer space</p> Signup and view all the answers

    What is the main reason the atmosphere is crucial for sustaining life on Earth?

    <p>It provides essential gases for respiration and photosynthesis</p> Signup and view all the answers

    What is the relationship between altitude and density?

    <p>Higher altitude means lower density</p> Signup and view all the answers

    In which layer of the atmosphere do space shuttles typically orbit?

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

    What is the characteristic of the temperature gradient in the mesosphere?

    <p>It decreases with altitude</p> Signup and view all the answers

    What is the main feature of the thermosphere?

    <p>It is where space shuttles orbit</p> Signup and view all the answers

    What is the primary function of the atmosphere?

    <p>All of the above</p> Signup and view all the answers

    Which layer of the atmosphere has a temperature gradient that increases with altitude?

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

    What is the result of the ozone layer absorbing UV radiation in the stratosphere?

    <p>The temperature increases with altitude</p> Signup and view all the answers

    What is the characteristic of the atmosphere in terms of altitude and density?

    <p>Higher altitude means lower density</p> Signup and view all the answers

    Which of the following is NOT a characteristic of the atmosphere?

    <p>It is a solid layer</p> Signup and view all the answers

    What is the primary reason the atmosphere is crucial for sustaining life?

    <p>It provides oxygen for respiration</p> Signup and view all the answers

    What is the transition zone between the Earth's atmosphere and outer space?

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

    What is the primary component of the atmosphere?

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

    What is the effect of gravity on the atmosphere?

    <p>It attracts gas molecules towards the Earth</p> Signup and view all the answers

    What is the order of the layers of the atmosphere, from the Earth's surface to space?

    <p>Troposphere, stratosphere, mesosphere, thermosphere</p> Signup and view all the answers

    What characteristic does the troposphere share with the atmosphere as a whole?

    <p>It contains the majority of the atmosphere's mass</p> Signup and view all the answers

    What is a feature of the atmosphere's composition?

    <p>It is primarily composed of nitrogen</p> Signup and view all the answers

    What is true about the atmosphere's layers?

    <p>Each layer has distinct characteristics</p> Signup and view all the answers

    What is the result of the atmosphere's gas molecules being more concentrated near the Earth's surface?

    <p>The atmosphere becomes less dense with altitude</p> Signup and view all the answers

    What is the primary reason why the atmosphere is able to maintain its composition?

    <p>The Earth's gravity</p> Signup and view all the answers

    Which of the following layers of the atmosphere has the highest concentration of gas molecules?

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

    What is the characteristic of the gas molecules in the atmosphere as altitude increases?

    <p>They become less concentrated</p> Signup and view all the answers

    Which of the following gases is NOT a major component of the atmosphere?

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

    What is the characteristic of the atmosphere's layers in terms of their structure?

    <p>They are distinct and concentric</p> Signup and view all the answers

    What is the result of the atmosphere's gases being more concentrated near the Earth's surface?

    <p>The atmosphere is more prone to weather disturbances</p> Signup and view all the answers

    What is the characteristic of the atmosphere's transition into outer space?

    <p>It is gradual and smooth</p> Signup and view all the answers

    What is the primary reason for the temperature increase with altitude in the stratosphere?

    <p>Absorption of ultraviolet radiation by the ozone layer</p> Signup and view all the answers

    Which of the following is a characteristic of the thermosphere?

    <p>It contains ionized gases and is where auroras occur</p> Signup and view all the answers

    What is the primary factor that differentiates the exosphere from the other atmospheric layers?

    <p>Very few particles that can escape into space</p> Signup and view all the answers

    What is the significance of the atmosphere's temperature maintenance function?

    <p>It traps heat and keeps the planet warm</p> Signup and view all the answers

    Which of the following is a consequence of the atmosphere's density gradient?

    <p>The number of gas molecules decreases with altitude</p> Signup and view all the answers

    What is the primary reason for the atmosphere's importance in sustaining life?

    <p>It provides essential gases for respiration and photosynthesis</p> Signup and view all the answers

    What is the characteristic of the temperature gradient in the mesosphere?

    <p>It decreases with altitude</p> Signup and view all the answers

    What is the primary function of the atmosphere's ozone layer?

    <p>It absorbs and scatters ultraviolet radiation</p> Signup and view all the answers

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