Visitors rest near a dock of Rangitoto Island, Auckland, New Zealand, on June 16, 2018. Rangitoto Island, located east of Auckland, was formed by volcano eruptions around 600 years ago. (Xinhua/Guo Lei)

A scene of the city of Auckland is seen from the top of a mountain at Rangitoto Island, Auckland, New Zealand, on June 16, 2018. Rangitoto Island, located east of Auckland, was formed by volcano eruptions around 600 years ago. (Xinhua/Guo Lei)

A lighthouse is seen on the lava of Rangitoto Island, Auckland, New Zealand, on June 16, 2018. Rangitoto Island, located east of Auckland, was formed by volcano eruptions around 600 years ago. (Xinhua/Guo Lei)