GEOLOGY

EARTH SCIENCE

VOLCANOES

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
An explosive eruption will happen when the magma is high in what?
A
silica
B
water
C
lava
D
rocks
Explanation: 

Detailed explanation-1: -Magmas with high silica content have a high viscosity (resistance to flow) and are generally more explosive when eruptions occur.

Detailed explanation-2: -The magma types vary from mafic magmas, which have relatively low silica and high Fe and Mg contents, to felsic magmas, which have relatively high silica and low Fe and Mg contents.

Detailed explanation-3: -Because it is more difficult for dissolved gas to escape from more viscous magma, higher silica magmas generally erupt more explosively.

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