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    science
    Grade-4-
    Easy

    Question

    Which is the oldest rock in the image?

    1. Limestone
    2. Slate
    3. Siltstone
    4. Sandstone

    Hint:

    The slate is the oldest rock that lies at the bottom of all the rock layers.

    The correct answer is: Slate

      • The layers of rock form according to the formation of new rock which is sedimented one above another.
      • The first formed oldest rocks will be at the bottom. 
      • The newly formed rocks will be on top of the elder rocks.
      • As the slate lies at the bottom, it is the oldest rock.

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