Volcanos 4 marker. Help?!?!?!?

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emiliakukielka
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Hi guys can anyone help with this question i have no idea where to start


The magma and lava produced at constructive plate margins are low in silica content. To what extent does this affect the nature of volcanic eruptions found at this type of boundary? (4 marks)
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username2088165
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(Original post by emiliakukielka)
Hi guys can anyone help with this question i have no idea where to start


The magma and lava produced at constructive plate margins are low in silica content. To what extent does this affect the nature of volcanic eruptions found at this type of boundary? (4 marks)
You could firstly mention how the low silica content affects the viscosity of the lava, i.e. low silica content means the lava is more fluid, as is the case with basalt. Fluid lavas also have fewer volatiles in them as gases can escape from them easily, which means that they produce relatively gentle, effusive eruptions in which lava fountains and lava flows are common. Effusive eruptions tend to produce shield volcanoes which have shallow slopes (or pillow lavas in the case of mid-ocean ridges), in contrast with explosive eruptions which form steep stratovolcanoes and have pyroclastic flows and ash falls as their most common hazards.

Silica content is basically an important compositional control on the viscosity of the magma, which in turn affects the style of eruption and types of volcanic hazards that are produced.

I hope that helps
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emiliakukielka
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(Original post by Leviathan1741)
You could firstly mention how the low silica content affects the viscosity of the lava, i.e. low silica content means the lava is more fluid, as is the case with basalt. Fluid lavas also have fewer volatiles in them as gases can escape from them easily, which means that they produce relatively gentle, effusive eruptions in which lava fountains and lava flows are common. Effusive eruptions tend to produce shield volcanoes which have shallow slopes (or pillow lavas in the case of mid-ocean ridges), in contrast with explosive eruptions which form steep stratovolcanoes and have pyroclastic flows and ash falls as their most common hazards.

Silica content is basically an important compositional control on the viscosity of the magma, which in turn affects the style of eruption and types of volcanic hazards that are produced.

I hope that helps
Thank you for answering that did help me answer my question! So I basically have to state and explain how the different types of lava flows will affect the volcanoes.

That simiplied the question thanks!
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username2088165
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(Original post by emiliakukielka)
Thank you for answering that did help me answer my question! So I basically have to state and explain how the different types of lava flows will affect the volcanoes.

That simiplied the question thanks!
That would be my interpretation of how to answer the question
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