Knowra Macquarie Island Macquarie Island Macquarie Island is an Australian subantarctic island in the Southern Ocean, noted for large seabird and seal colonies and exposed rocks from Earth’s mantle and oceanic crust.
Macquarie Ridge : An underwater ridge in the Southern Ocean formed along the boundary between the Australian and Pacific plates. The island is the ridge’s only substantial part above sea level.
Ophiolite : A sequence of rocks from oceanic crust and upper mantle exposed on land. Macquarie Island is a rare example formed through active seafloor spreading rather than later emplacement.
King penguin : A large penguin species that breeds in colonies on subantarctic islands and feeds at sea. Thousands breed on Macquarie Island, where their colonies shape the coastal landscape.
Macquarie Island Station : An Australian research station on Macquarie Island, operated for scientific and meteorological work. The station enables year-round monitoring of the island’s ecosystems and climate.
Macquarie Triple Junction : A region where the Australian, Pacific, and Antarctic tectonic plates meet. Plate interactions near this junction shaped the ridge that carries the island.
Peridotite : A coarse-grained igneous rock composed mainly of olivine and pyroxene, common in Earth’s upper mantle. Its occurrences on the island expose rocks derived from the mantle.
Royal penguin : A crested penguin species that breeds almost exclusively on Macquarie Island and nearby islets. Its restricted breeding range makes the island central to the species’ survival.
Macquarie Island pest eradication : A 2010–2014 program that removed introduced rabbits, rats, and mice from Macquarie Island. The eradication reversed severe habitat damage and allowed native vegetation to recover.
Subantarctic : The cool maritime zone of Southern Hemisphere islands and waters north of Antarctica. Its climate sets the island’s limits for plants, animals, and human activity.
Basalt : A dark, fine-grained volcanic rock produced when iron- and magnesium-rich lava cools quickly. Basaltic rocks on the island record the formation of oceanic crust.
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