Geology and Minerals
Kuwae was a landmass that existed in the vicinity of Tongoa and was destroyed by volcanic eruption in the fifteenth century, probably through caldera subsidence. Its exact location is debated. A submarine caldera now known as the Kuwae caldera is a candidate, located between the Epi and Tongoa islands and cutting through the flank of the Tavani Ruru volcano on Epi and the northwestern end of Tongoa. Another candidate is a proposed caldera between Tongoa and Tongariki. The submarine volcano Karua, one of the most active volcanoes of Vanuatu, is near the northern rim of the Kuwae caldera.
Canadian Shield.
Environmental radioactivity.
Text from Wikipedia; plate via Wikimedia Commons. Text CC BY-SA 4.0; plate freely licensed (see Commons). Source record. Images and catalogue data are reproduced from open-access collections.