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Which of the following is not an active volcano?
Mount Kilimanjaro, situated in Tanzania, is the highest peak in Africa. It is categorized as a dormant stratovolcano rather than an active one. The mountain features three distinct volcanic cones: Shira, Mawenzi and Kibo. Shira and Mawenzi are considered extinct, meaning they have no magma supply. HRead more
Mount Kilimanjaro, situated in Tanzania, is the highest peak in Africa. It is categorized as a dormant stratovolcano rather than an active one. The mountain features three distinct volcanic cones: Shira, Mawenzi and Kibo. Shira and Mawenzi are considered extinct, meaning they have no magma supply. However, Kibo is technically dormant; it hasn’t erupted for over 360,000 years, but scientists have detected fumaroles and sulfurous gases at its crater, indicating subsurface heat. This distinguishes it from active volcanoes like Etna or Stromboli, which erupt regularly and highlights the geological complexity of the East African Rift system.
See lessWhich of the following types of volcanoes has the most explosive eruption?
Pelean eruptions are the most violent because they involve magma with a very high silica content. This makes the magma thick and sticky, preventing gases from escaping easily. Consequently, a lava dome often forms over the vent, acting like a cork in a pressurized bottle. When the dome fails, it triRead more
Pelean eruptions are the most violent because they involve magma with a very high silica content. This makes the magma thick and sticky, preventing gases from escaping easily. Consequently, a lava dome often forms over the vent, acting like a cork in a pressurized bottle. When the dome fails, it triggers a catastrophic lateral blast. The most terrifying feature is the pyroclastic flow—a dense, turbulent cloud of incandescent ash and gas that can reach temperatures of 1,000 degrees Celsius. These flows move at hundreds of miles per hour, making the Pelean type the deadliest volcanic category.
See lessWhich of the following is not an extinct volcano? (A) Mauna Loa (B) Demavand (C) Chimborazo (D) Koh-i-Sultan
Mauna Loa is an active shield volcano located in Hawaii and is the largest subaerial volcano on our planet. It is part of the Hawaiian hotspot chain and has erupted thirty-four times since its first well-documented eruption in 1843. This high frequency of activity contrasts sharply with extinct volcRead more
Mauna Loa is an active shield volcano located in Hawaii and is the largest subaerial volcano on our planet. It is part of the Hawaiian hotspot chain and has erupted thirty-four times since its first well-documented eruption in 1843. This high frequency of activity contrasts sharply with extinct volcanoes like Demavand or Chimborazo. Extinct volcanoes have no magma supply and are unlikely to erupt again over geological timescales. Mauna Loa’s frequent basaltic lava flows and monitored seismic activity confirm it is very much alive, making it a critical site for global volcanic research and hazard monitoring.
See lessThe correct ascending order of types of volcanoes based on the intensity of eruption is:
Volcanic eruptions are classified by their violence and the viscosity of their magma. Hawaiian eruptions are the least intense, producing fluid basaltic lava flows. Strombolian eruptions follow, involving moderate bursts of glowing cinders. Vulcanian eruptions are significantly more powerful, launchRead more
Volcanic eruptions are classified by their violence and the viscosity of their magma. Hawaiian eruptions are the least intense, producing fluid basaltic lava flows. Strombolian eruptions follow, involving moderate bursts of glowing cinders. Vulcanian eruptions are significantly more powerful, launching dark, ash-laden clouds and solid rock fragments. At the peak of intensity is the Pelean type, named after Mount Pelée. These are characterized by extremely thick magma that traps gases until they explode, generating nuées ardentes or pyroclastic flows. This scale helps seismologists categorize the danger levels associated with different volcanic structures and their specific tectonic settings.
See lessWhere is the Valley of Ten Thousand Smokes found?
The Valley of Ten Thousand Smokes is a spectacular volcanic landscape in Alaska, USA. It was created following the 1912 eruption of Novarupta, which deposited ash flows up to 700 feet deep across the region. As surface water filtered down into the hot ash, it turned into steam, emerging through thouRead more
The Valley of Ten Thousand Smokes is a spectacular volcanic landscape in Alaska, USA. It was created following the 1912 eruption of Novarupta, which deposited ash flows up to 700 feet deep across the region. As surface water filtered down into the hot ash, it turned into steam, emerging through thousands of fumaroles. Botanist Robert Griggs discovered the valley in 1916 and gave it its descriptive name. While most of these steam vents have since vanished as the ash cooled, the area remains a vital location for geologists studying ignimbrite deposits and explosive volcanic history.
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