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At 475,440 km2 (183,570 sq mi), Cameroon is the world's 53rd largest country. It is slightly larger than the nation of Sweden and US state of California. It is comparable in size to Papua New Guinea. Cameroon's landmass is 472,710 km2 (182,510 sq mi), with 2,730 km2 (1,050 sq mi) of water.
Olympus Mons is a very large shield volcano on the planet Mars. The volcano has a height of over 21 km as measured by the Mars Orbiter Laser Altimeter (MOLA). Olympus Mons is about two and a half times Mount Everest's height above sea level. It is one of the largest volcanoes, the tallest planetary mountain, and the second tallest mountain currently discovered in the Solar System, comparable to Rheasilvia on Vesta. It is often cited as the largest volcano in the Solar System. However, by some metrics, other volcanoes are considerably larger. Alba Mons, northeast of Olympus Mons, has roughly 19 times the surface area, but is only about one third the height. Pele, the largest known volcano on Io, is also much larger, at roughly 4 times the surface area, but is considerably flatter. Additionally, Tharsis Rise, a large volcanic structure on Mars of which Olympus Mons is a part, has been interpreted as an enormous spreading volcano. If this is confirmed, Tharsis would be by far the largest volcano in the Solar System. Olympus Mons is the youngest of the large volcanoes on Mars, having formed during Mars's Hesperian Period. It had been known to astronomers since the late 19th century as the albedo feature Nix Olympica. Its mountainous nature was suspected well before space probes confirmed its identity as a mountain.
Réunion is an island in Southern Africa, in the Indian Ocean, east of Madagascar. It is an overseas region of France. The total area of the island is 2,512 km², of which 10 km² is water. The island has a coastline of 207 km. The maritime claims of Réunion include an exclusive economic zone of 200 nautical miles, and a territorial sea of 12 nautical miles (22 km). Reunion is geologically situated in the Somali plate.
Tanzania comprises many lakes, national parks, and Africa's highest point, Mount Kilimanjaro. Northeast Tanzania is mountainous, while the central area is part of a large plateau covered in grasslands. The country also contains the southern portion of Lake Victoria on its northern border with Uganda and Kenya.
A volcano is a rupture in the crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface.
The Ring of Fire is a major area in the basin of the Pacific Ocean where many earthquakes and volcanic eruptions occur. In a large 40,000 km (25,000 mi) horseshoe shape, it is associated with a nearly continuous series of oceanic trenches, volcanic arcs, and volcanic belts and plate movements. It has 452 volcanoes.
Mayon Volcano, also known as Mount Mayon, is a sacred and active stratovolcano in the province of Albay in Bicol Region, on the large island of Luzon in the Philippines. A popular tourist spot, it is renowned for its "perfect cone" because of its symmetric conical shape.
A shield volcano is a type of volcano usually composed almost entirely of fluid lava flows. It is named for its low profile, resembling a warrior's shield lying on the ground. This is caused by the highly fluid lava erupted, which travels farther than lava erupted from a stratovolcano, and results in the steady accumulation of broad sheets of lava, building up the shield volcano's distinctive form.
Taal Volcano is a large caldera filled by Taal Lake in the Philippines. Located in the province of Batangas, the volcano is the second most active volcano in the Philippines, with 34 recorded historical eruptions, all of which were concentrated on Volcano Island, near the middle of Taal Lake. The caldera was formed by prehistoric eruptions between 140,000 and 5,380 BP.
Several types of volcanic eruptions—during which lava, tephra, and assorted gases are expelled from a volcanic vent or fissure—have been distinguished by volcanologists. These are often named after famous volcanoes where that type of behavior has been observed. Some volcanoes may exhibit only one characteristic type of eruption during a period of activity, while others may display an entire sequence of types all in one eruptive series.
Guadalupe Victoria Municipality is a municipality in the Mexican state of Puebla. According to the National Statistics Institute (INEGI), it had a population of 15,041 inhabitants in the 2005 census. Its total area is 239.83 km². It is named after Guadalupe Victoria, the first president of Mexico.
The coat of arms of Réunion represents the island and overseas departement of Réunion. The coat of arms is created by Émile Merwart in 1925 on the occasion of a colonial exhibition that was to be held in Petite-Île.
Dabbahu Volcano is an active volcano located in the remote Afar Region of Ethiopia. This stratovolcano is part of the Afar Triangle, a highly active volcanic region which includes Erta Ale. An eruption on September 26, 2005 created a large fissure in the ground, known as the Dabbahu fissure.
Cape Verde is a volcanic archipelago situated above an oceanic rise that puts the base of the islands 2 kilometers (1.2 mi) above the rest of the seafloor. Cape Verde has been identified as a hotspot and it has been argued that a mantle plume might be underneath it causing the volcanic activity and associated geothermal anomalies.
The national parks of Rwanda are protected ecosystems and wildlife reserves located within the borders of Rwanda in east central Africa. In 2020, these protected natural zones include the Volcanoes National Park, Akagera National Park and Nyungwe Forest. Maintenance of the national park system, as well as tourism infrastructure and promotion of the parks, is managed by the Rwanda Development Board (RDB) with assistance from government ministries.
The geology of Rwanda comprises Mesoproterozoic metasediments, largely quartzites, sandstones, and shales of the Burundian Supergroup which are locally intruded by granite. There are four types of granite in the Kibaran Belt. In eastern Rwanda are the “older granites” along with granitic-gneisses and migmatites of Palaeoproterozoic age. In the northwest and southwest are Neogene volcanics, ranging in age from Cenozoic to recent. Some of the volcanoes in the area are highly alkaline. Alluvium and lake sediments of Quaternary age occur in parts of the Western Rift and along rivers and lakes.
The Comoros island chain in the Mozambique Channel is the result of the rifting of Madagascar away from Africa as well as "hotspot" mantle plume activity. The region is also impact by seismicity and deformation associated with the East African Rift system and the Comoros region is one of the best places in the world to study rift-hotspot interactions. The islands remain volcanically active.
Réunion is a mafic island formed as a result of the Réunion hotspot in the Indian Ocean, the same hotspot that produced the massive basalt flows of the Deccan Traps, when it was beneath India more than 66 million years ago.
The geology of Mauritius and Rodrigues is comparatively recent. The oldest rocks on Mauritius are only 10 million years old and 1.54 million years old on Rodrigues Island. The mafic basalts of the two islands formed in relation to the hotspot that generated the Deccan Traps and coral reefs built on the volcanoes forming non-volcanic sediments.
References
- Siebert L, Simkin T (2002–present). Volcanoes of the World: an Illustrated Catalog of Holocene Volcanoes and their Eruptions. Smithsonian Institution, Global Volcanism Program Digital Information Series, GVP-3 (http://www.volcano.si.edu).