THE EARTH
VOLCANOES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Composite volcanoes usually erupt in explosive way as, when the viscuss magma rise to a surface it usually cbqs the _________ so in the result _________ will increase resulting in an explosive eruption:
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Pressure, crater pipe
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Mantle plume, gas
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Crater pipe, pressure
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None of these
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Explanation:
Detailed explanation-1: -While composite volcanoes erupt less frequently than the other types of volcanoes, they sure make up for it, packing quite a punch with each blast. The lava from a composite volcano is less fluid, and the thick mixture of minerals it contains are highly explosive. The results are very dangerous, and often deadly.
Detailed explanation-2: -Explosive eruptions occur where cooler, more viscous magmas (such as andesite) reach the surface. Dissolved gases cannot escape as easily, so pressure may build up until gas explosions blast rock and lava fragments into the air! Lava flows are much more thick and sticky so do not flow downhill as easily.
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