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Glass House Mountains National Park is a national park in Queensland (Australia), 70 km northeast of Brisbane. It consists of a flat plain punctuated by rhyolite and trachyte volcanic plugs, the cores of extinct volcanoes that formed 27 million to 26 million years ago. The mountains would once have had pyroclastic exteriors, but these have eroded away. The park was established in 1994. On the 23 June 2010 ...
