The document discusses the origin and journey of a rock found in Hamilton, New Zealand. It suggests that the rock originated from an eruption of Mount Tongariro in 1896, as magma that solidified into lava and rolled into a stream. Over time, erosion from water, wind and other factors transported the rock down the Waikato River until it was found in Anne Street, Hamilton. The rock is classified as igneous due to its volcanic origin as a piece of lava. Had it not been picked up, it likely would have continued eroding down the river until reaching the ocean floor.