How Do Volcanoes Form At B??
Volcanoes form at B when the oceanic plate is subducted and the plate melts and forms magma. This magma rises towards the surface and erupts as lava which forms the volcanoes. … Magma melts through the crust and moves to the surface in a hot spot. Also a collision between two oceanic plates can form volcanoes.
How do volcanoes form at a?
On land volcanoes form when one tectonic plate moves under another. Usually a thin heavy oceanic plate subducts or moves under a thicker continental plate. … When enough magma builds up in the magma chamber it forces its way up to the surface and erupts often causing volcanic eruptions.
How do volcanoes form your answer?
What type of volcano is shown in B?
Volcano B is a shield volcano. It forms when thin layers of lava pour out of a vent and harden on top of previous layers. It’s a wide gently sloping mountain. Volcano C is a composite volcano.
What types of volcanoes form at mid ocean ridges?
Spreading center volcanism occurs at the site of mid-oceanic ridges where two plates diverge from one another. As the plates are pulled apart hot asthenosphere rises upward to fill voids of the extended lithosphere.
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What type of volcanic rocks would you expect to be erupted from B above?
What type of volcanic rocks would you expect to be erupted from ‘B’ above? basalt. Of what type volcanic rock do you think the feature in ‘H’ is composed?
Are basaltic eruptions mild or violent?
Basaltic eruptions often are relatively quiescent producing lava flows and small strombolian eruptions. On the other hand andesitic eruptions often are much more violent sometimes plinian. … vesiculation of previously hydrated melts of basaltic andesitic and dacitic compositions at temperatures reaching 1200 °C.
What does lahar mean?
How will you describe the formation of volcanoes near the mid-ocean ridge?
Mid-ocean ridge volcanoes form where two plates are moving apart. As the plates move apart cracks form in the crust. Magma from the mantle surges up these cracks and erupts onto the surface forming new crust. … Mid-ocean ridge volcanoes produce huge volumes of lava.
How are ridges formed?
A mid-ocean ridge or mid-oceanic ridge is an underwater mountain range formed by plate tectonics. This uplifting of the ocean floor occurs when convection currents rise in the mantle beneath the oceanic crust and create magma where two tectonic plates meet at a divergent boundary.
What are volcanoes describe the landforms created by volcanoes?
These landforms include shield volcanoes cinder cone volcanoes composite volcanoes and lava plateaus. A shield volcano is a gently sloping mountain. It forms when a volcano erupts quietly. Thin layers of lava build up slowly over a large area around the vent.
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How can you figure out if a volcano makes felsic or basaltic lava?
The cooler the lava the higher the viscosity (the thicker it is). Composition: he more felsic the lava (the more silica in the lava) the higher the viscosity because silica forms chains in the cooling lava even before it crystallizes. The more mafic the lava (the less silica in it) the lower the viscosity.
What type of volcano is the most explosive?
Stratovolcanoes are considered the most violent. Mount St. Helens in Washington state is a stratovolcano that erupted on May 18 1980.
Which volcano do you think is formed from non viscous oozing lava?
Shield Volcanoes
Shield Volcanoes Because of their non-viscous mafic magma they tend to have relatively gentle slopes (2 to 10˚) and the larger ones can be over 100 km in diameter. The best-known shield volcanoes are those that make up the Hawaiian Islands and of these the only active ones are on the big island of Hawaii.
Was Mt Everest a volcano?
Mount Everest is not an active volcano. It is not a volcano but a folded mountain formed at the point of contact between the Indian and Eurasian…
Will Mount Shasta erupt again?
Why are lava domes viscous?
How does a cold lahar form?
Eruptions may trigger lahars by melting snow and ice or by ejecting water from a crater lake. … Lahars can also be formed when high-volume or long-duration rainfall occurs during or after an eruption.
What is the difference between lahar and lava flow?
Everything in the path of an advancing lava flow will be knocked over surrounded or buried by lava or ignited by the extremely hot temperature of lava. When lava erupts beneath a glacier or flows over snow and ice meltwater from the ice and snow can result in far-reaching lahars.
What do you call a mudflow formed from a mixture of volcanic water and rock fragments?
Lahars
lahar mudflow of volcanic material. Lahars may carry all sizes of material from ash to large boulders and produce deposits of volcanic conglomerate.6 days ago
How are volcanoes formed in convergent boundaries?
If two tectonic plates collide they form a convergent plate boundary. Usually one of the converging plates will move beneath the other a process known as subduction. … The new magma (molten rock) rises and may erupt violently to form volcanoes often building arcs of islands along the convergent boundary.
Volcanic eruption explained – Steven Anderson
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