GEOLOGY

EARTH SCIENCE

VOLCANOES

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Which type of lava has a high viscosity, is felsic, silica rich and has explosive eruptions?
A
Rhyolitic Lava
B
Andesitic Lava
C
Basaltic Lava
D
None of the above
Explanation: 

Detailed explanation-1: -Felsic lavas are not as hot, high in silica and volatiles, and have a high viscosity. They are thick and gooey and resist flowing. Their high volatile content makes them potentially highly explosive.

Detailed explanation-2: -Rhyolitic/Andesitic Lava Magma that has a higher viscosity and silica content produces rocks that are called rhyolite and andesite.

Detailed explanation-3: -Rhyolitic and andesitic are two types of magmas that are highly explosive. Each one produces volcanoes that have huge explosions. Also, these types of magmas will produces volcanoes that are taller in size and made of multiple layers of ash and lava, such as a cinder cone and stratovolcano.

Detailed explanation-4: -Rhyolitic magmas tend to have even higher viscosity, ranging between 1 million and 100 million times more viscous than water.

Detailed explanation-5: -Composite volcanoes are some of the most dangerous volcanoes on the planet. They tend to occur along oceanic-to-oceanic or oceanic-to-continental boundaries because of subduction zones. They tend to be made of felsic to intermediate rock and the viscosity of the lava means that eruptions tend to be explosive.

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