Viscosity

The ability of a liquid to flow. Basalt magma has a relatively low viscosity making it runny, whereas rhyolite magma has a high viscosity making the magma thick and sticky. Volcanic environment hazards: Hazards that may exist on or near a volcano, even though there may not be an eruption or volcanic unrest taking place. These hazards may include hydrothermal activity, earthquakes, landslides, volcanic gases, and/or lahars.