SSC Geography Sample Paper NCERT Sample Paper-4

  • question_answer
    What is the exact sequence of atmospheric layers in ascending order from the surface of the earth?

    A)  Troposphere, Stratosphere, Mesosphere, Ionosphere

    B)  Troposphere, Exosphere, Mesosphere, Stratosphere

    C)  Stratosphere, Mesosphere, Exosphere, Troposphere

    D)  Ionosphere, Troposphere, Mesosphere, Stratosphere

    Correct Answer: A

    Solution :

    [a] Troposphere: This is the lowest atmospheric layer and is about seven miles (11 km) thick. Most clouds and weather are found in the- troposphere. The troposphere is thinner at the poles (averaging about 8km thick) and thicker at the equator (averaging about 16km thick). The temperature decreases with altitude. Stratosphere: The stratosphere is found from about 7 to 30 miles (11-48 kilometres) above the Earth's surface. In this region of the atmosphere is the ozone layer, which absorbs most of the harmful ultraviolet radiation from the Sun. The temperature increases slightly with altitude in the stratosphere. The highest temperature in this region is about 32 degrees Fahrenheit or 0 degrees Celsius. Mesosphere: The mesosphere is above the stratosphere. Here the atmosphere is very rarefied, that is, thin, and the temperature is decreasing with altitude, about \[-\,130\]Fahrenheit (\[-\,90\] Celsius) at the top. Ionosphere: The ionosphere overlaps the other atmospheric layers, from above the Earth. The air is ionized by the Sun's ultraviolet light. These ionized layers affect the transmittance and reflectance of radio waves.

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