UPSC General Studies Sample Paper General Studies Sample Paper-6

  • question_answer
    Consider the following statements regarding the Earth's crust.                          
    1. The thickness of the Earth's crust is uniform, but the density of the Earth's crust is variable.    
    2. Continental crust is composed mostly of granite whereas oceanic crust consists of a volcanic rock called basalt.                                                                       
    3. Density of mountain areas is less than the mean density of material in oceanic crust.         
    Which of the statements] given above is/are correct?                                   

    A)  Only 2             

    B)  2 and 3                

    C)                  1 and 2           

    D)  All of these                          

    Correct Answer: A

    Solution :

    [a] Statement 1 is incorrect as, both thickness as well as density of the crust are variable. They are more in continental crust than in oceanic crust. Statement 2 is correct. Statement 3 is also incorrect. The density of rocks (in continental crust) is more than the density of oceanic crust. (Oceanic crust density\[2.7g/c{{m}^{3}}\]) (Continental crust density\[3g/c{{m}^{3}}\])

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