1. Viscosity is a physical property. Viscosity of a substance can be observed without changing the chemical composition of the substance.
2. As viscosity increases a liquid will flow more slowly. So a high viscosity means a slower flowing liquid. A low viscosity means a faster flowing liquid.
3. Increased friction between particles mean higher viscosity (more resistance to flowing). So increased friction also mean a liquid will flow more slowly.
4. Temperature and silica content effect the viscosity of magma.
Higher temperature means a lower viscosity.
Higher silica content means a higher viscosity. (think "silica is sticky")
Aa is higher viscosity magma, and pahoehoe is lower viscosity magma.
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