Answer:
a. granite, andesite, basalt
Explanation:
There are three basic different types of magma: rhyolithic, andesitic, and basaltic. These three types of magma have different properties which differs them from one another, and which cause different types of eruptions. The rhyolithic (granite) magma has very high viscosity. This magma is the thickest, managing to trap gases in it, and because of it it causes highly explosive eruptions. The andesitic magma is moderate in viscosity, and it has explosive eruptions, but also has lava flows that are relatively slow, so it is very unpredictable what kind of an eruption will the volcano have. The basaltic magma is the least viscous. This means that the eruptions of these volcanoes are not explosive, but instead they produce thin lava flows that cover the surrounding area.
Basalt, andesite and granite solidified rocks of a volcano which contains different viscosity of magma.
The correct order (from left to right) of decreasing magma viscosity is granite, andesite, basalt , option A is correct.
The viscosity of magma in the solidified rocks can be said as the capacity to resist the flow of lava of the rock. These rocks based on their viscosity control the flow of lava during a volcanic eruption.
The granite is a solidified rock that is of the granitic magma type and has the highest viscosity in all the three rocks.
The andesite is a solidified rock that is of the andesitic magma type and has intermediate viscosity in all the three rocks.
The basalt is a solidified rock that is of the basaltic magma type and has lowest viscosity in all the three rocks.
Therefore, the correct order (from left to right) of decreasing magma viscosity is granite, andesite, basalt , option A is correct.
Learn more about magma viscosity here:
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