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Volcanoes are usually mountains (sometimes islands, lakes, plateaus, calderas, seamounts or lava domes) that are formed when magma (liquid rock) wells up from inside the Earth. There are also analogous formations away from the Earth. Many volcanoes are categorized both as volcanoes and other landforms, such as mountains (if qualified).
Due to this, Aconcagua is not considered to be a volcano on its own, at least not as a member of Volcanic Seven Summits. Topographic maps of the Argentina and Chile border region which contains the highest peaks suffer from poor accuracy, with elevation errors exceeding 100 metres (330 ft) in many cases.
List of volcanoes in Algeria; List of volcanoes in Cameroon; List of volcanoes in Cape Verde; List of volcanoes in Chad; List of volcanoes in the Comoros; List of volcanoes in the Democratic Republic of the Congo; List of volcanoes in Djibouti; List of volcanoes in Equatorial Guinea; List of volcanoes in Eritrea; List of volcanoes in Ethiopia
The word volcano (UK: /vɒlˈkeɪnəʊ/; and US /vɔlˈkeɪnoʊ/) originates from the early 17th century, derived from the Italian vulcano, a volcanic island in the Aeolian Islands of Italy whose name in turn comes from latin volcānus or vulcānus referring to Vulcan, the god of fire in Roman mythology.
A topographic map of Ngorongoro Crater in northern Tanzania, the world's largest inactive, intact, and unfilled volcanic caldera, which formed when an immense volcano erupted and collapsed on itself 2–3 million years ago. The floor of the caldera is 600 metres (2,000 ft) below its rim and covers more than 260 square kilometres (100 sq mi).
Mount Edziza, a stratovolcano in northwestern British Columbia A topographic map of Canada, showing elevations shaded from green (lower) to brown (higher). Volcanic activity is a major part of the geology of Canada and is characterized by many types of volcanic landform, including lava flows, volcanic plateaus, lava domes, cinder cones, stratovolcanoes, shield volcanoes, submarine volcanoes ...
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