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Volcanism Video Lecture | Geography for UPSC CSE
FAQs on Volcanism Video Lecture - Geography for UPSC CSE
| 1. What causes volcanic eruptions? |  |
Ans.Volcanic eruptions are caused by the movement of magma from beneath the Earth's crust to the surface. This movement is often triggered by the buildup of pressure from gases dissolved in the magma, which can lead to explosive eruptions or lava flows when the pressure is released.
| 2. What are the different types of volcanoes? | |
Ans.There are four main types of volcanoes: shield volcanoes, stratovolcanoes (or composite volcanoes), cinder cone volcanoes, and lava domes. Shield volcanoes have gentle slopes and are built from low-viscosity lava, while stratovolcanoes are steeper and formed from alternating layers of lava and ash. Cinder cone volcanoes are the smallest and are built from volcanic ash and debris, and lava domes are formed from the slow accumulation of viscous lava.
| 3. How do scientists monitor volcanic activity? | |
Ans.Scientists monitor volcanic activity using various methods, including seismographs to detect earthquakes, GPS to measure ground deformation, gas emissions monitoring, and satellite imagery. These tools help predict eruptions and assess the potential hazards associated with a volcano.
| 4. What are the hazards associated with volcanic eruptions? | |
Ans.Volcanic eruptions pose several hazards, including lava flows, ash fall, pyroclastic flows, volcanic gases, and lahars (mudflows). These hazards can cause significant damage to infrastructure, disrupt air travel, and endanger lives, making volcanic monitoring essential for public safety.
| 5. Can volcanic eruptions affect climate? | |
Ans.Yes, volcanic eruptions can affect climate. Large eruptions can release significant amounts of ash and sulfur dioxide into the atmosphere, which can lead to short-term cooling of the Earth's surface by reflecting sunlight. This phenomenon can result in altered weather patterns and can impact agriculture and ecosystems.
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