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UPSC Geography The origin and evolution of the earth Question Bank Universe / Sun / Planets / Earth

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    Which of the following is/are direct source (s) or information about the interior of the Earth? [NDA 2014-I]
    1. Earthquake wave
    2. Volcano
    3. Gravitational force
    4. Earth magnetism
    Select the correct answer using the codes given below

    A)  1 and 2                       

    B)  Only 2             

    C)  3 and 4                       

    D)  All of these

    Correct Answer: A

    Solution :

     Earthquake waves are propagating vibrations that carry energy from the source of the shaking outward in all directions. It is of four types:
    P (for primary)            S (for secondary)
    Love                     Rayleigh
    A volcano is a mountain that opens downward to a pool of molten rock below the surface of the earth.     When pressure builds up, eruptions occur


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