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  • A geologist looking at a cliff near Whanganui.
    Rights: The University of Waikato Te Whare Wānanga o Waikato Published 11 May 2011 Size: 56 KB Referencing Hub media

    The geologist looking at this cliff near Whanganui uses the principle of superposition to work out that the bottom layer is the oldest, the top layer is the youngest.

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