Step-by-step explanation:
1). Magma is defined as a liquid which is hot in nature occurs from Earth's crust and results in the formation of lava and igneous rocks upon cooling.
When there is less silica present in the magma then magma is able to flow easily because then gas bubbles move in the upward direction and thus they are able to gently escape.
Therefore, the amount of silica in the magma helps to determine how easily magma flows.
2). When a substance is made of two or more elements that have been chemically combined then it is called a compound.
For example, sodium chloride, water, magnesium chloride are all compounds.
3). Viscosity is defined as the ability to resist the flow. That is, when a liquid is not able to flow easily then it means that liquid has high viscosity.
For example, viscosity of honey is more than the viscosity of water.
Thus, we can conclude that the statement greater the viscosity of a liquid, the slower it flows is true.