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    science
    Grade-4-
    Easy

    Question

    Which of the following rock looks smooth and black in color?

    1. Conglomerate
    2. Sandstone
    3. Limestone
    4. Obsidian

    Hint:

    The obsidian rock looks smooth and black.

    The correct answer is: Obsidian

      • The obsidian rock looks smooth and black.
      • It has a glassy texture which has a smooth surface.
      • It is an extrusive igneous rock.

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