Correct answer choice is:
3) Friction
Explanation:
Low viscosity relates to materials that are thin, such as water, while high viscosity materials are thick. The viscosity of a fluid is a sum of its opposition to progressive deformation by shear strain or tensile stress. For liquids, it compares to the simple idea of thickness, for example, honey has a very greater viscosity than water.
Answer:
Option (3)
Explanation:
The magma that is comprised of low silica content is termed as low viscosity magma. By low viscosity magma, it means that the magma can easily flow over the surface, without any difficulty. This indicates that there is less friction between the surface and the flowing magma. Friction usually refers to the resistant force that obstructs the flow of a liquid in any direction.
When there is a high frictional force, then the liquid flows very slowly with much difficulty. On the other hand, when there is a low force of friction, then the liquid can flow easily over a surface.
Thus, in a low viscosity magma, there is low silica content, so there is less frictional force between the surface and the magma, and the magma flows easily over the surface.
Hence, the correct answer is option (3).