Web1 Explain why some volcanic eruptions are explosive and others are quiescent- and be able to relate to the Kilauea vs Pinatubo eruptions High- silica, low- temperature lavas are the most viscous and allow the greatest amount of pressure to build up before they " … Web2 apr. 2024 · Explosive eruptions occur at stratovolcanoes due to the high gas concentration in the magma. As the magma rises, the gases release, causing the pressure beneath the volcano to increase. Once this pressure becomes large enough, an explosive eruption occurs. What type of eruption is a stratovolcano?
Types of volcanoes A Level Geography
WebThe lava erupting from the shield volcanoes are runny and non-acidic. As the erupted lava is runny, they flow long distances before they solidify, this results in the gentle sides of shield volcanoes. There are shorter periods between eruptions, and the explosions are less violent. Shield volcanoes are found on divergent plate boundaries. WebLocation. Most explosive eruptions occur in volcanoes above subduction zones, where one tectonic plate dives beneath the other. Eighty to 120 kilometers below the surface, magma forms when the rocks of the mantle melt just above the subducting plate. The magma rises through the mantle, and erupts to form great composite volcanoes such as Vesuvius. chity na key drop
Shield and composite volcanoes - Volcanoes - CCEA
WebOther articles where shield volcano is discussed: volcano: Shield volcanoes: Structures of this type are large dome-shaped mountains built of lava flows. Their name derives … WebWhen the magma has little water in it, it is not explosive and is less likely to erupt violently. Eruptions of shield volcanoes often occur as lava oozes out of fissures in the volcano's vents. Web25 apr. 2024 · Felsic Volcanoes: Volcanoes that produce felsic lavas have very high explosivity due to their high concentrations of volatiles such as silicon and oxygen. The high viscosity of the lava also makes felsic volcanoes highly explosive, causing the lava to “clot” the mouth of the volcano. This builds up pressure until the volcanoes explodes. grasshopper human plugin