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Oldest at the bottom

A geologist looking at a cliff near Whanganui.

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.

Rights: The University of Waikato Te Whare Wānanga o Waikato
Published:11 May 2011Size: 55.63 KB