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  1. Which of the following is/are matched correctly?
    1. Earthquake's origin - seismic focus
    2. Epicentre - point on earth's surface directly above seismic focus
    3. S waves - similar to sound waves
    4. Richter scale - severity of earthquake

    2. A.

     1, 2, 3
    B.

     1, 2, 3 and 4
    C.

     2 and 4
    D.

     3 and 4

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    Answer : Option B

    Explanation :

    All the four are matched correctly. Earthquake's origin - seismic focus. Epicentre - point on earth's surface directly above seismic focus. S waves - similar to sound waves. Richter scale - severity of earthquake.

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