UPSC Geography Interior of the earth Question Bank Geomorphology

  • question_answer Consider the following statements
    1. Igneous rocks are rich in natural gas.
    2. Igneous rocks are rich in metallic minerals.
    3. Igneous rocks are not fossiferous.
    4. Igneous rocks consist of silicate minerals.
    Which of the statements given above are correct?

    A)  1, 2 and 3                    

    B)  1, 2 and 4                    

    C)  2, 3 and 4                    

    D)  1, 2, 3 and 4

    Correct Answer: C

    Solution :

     Igneous rocks are rocks formed from molten magma. The material is made liquid by the heat inside the Earth's mantle. When magma comes out onto the surface of the Earth, it is called lava. Lava cools down to form rocks such as tuff and basalt. Also. The magma may slowly cool down to form rocks under the surface. An example is granite. The upper 16 km (10 miles) of the Earth's crust is composed of about 95% igneous rocks. Sedimentary, rocks are the main source of natural gas

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