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  1. Which of the following best explain why the lower course of a river is sometimes choked with sediments?
    1. The valley of a river is widest in its lower course.
    2. The velocity of a river in its lower course is low.
    3. The delta sometimes develops in a river's lower course.
    4. Much of the river water is drawn for irrigation in the lower course.

    2. A.

     1, 2, 3 and 4
    B.

     1, 3 and 4 only
    C.

     1, 2 and 3 only
    D.

     2 and 4 only

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    Answer : Option C

    Explanation :

    The lower course of a river is sometimes choked with sediments because the valley of a river is widest in its lower course, the velocity of a river in its lower course is low and the delta sometimes develops in a river's lower course.

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