Answer:
4- Option (D)
5- Option (D)
Explanation:
The property of viscosity is usually defined as the amount of friction that occurs between the different layers of a fluid during the time of flow. The magma viscosity also is the same that occurs because of the generation of friction between the magma layers.
This viscosity of magma is directly dependent on the amount of silica content. If the amount of silica is more, then the magma is said to be of high viscosity, whereas if the amount of silica is less, then the magma is said to be of low viscosity.
During the time of extensive and strong volcanic eruption, a large number of broken rock fragments with fire are released. In addition to this, there also occurs the eruption of lava, and ash and smoke. These are collectively known as pyroclastic materials.
Thus, the correct answers are mentioned above.
