Why is a non viscous volcano less dangerous than a volcano with viscous lava?
High viscous lava is more dangerous because viscosity is a manifistation of Surface tension , a liquid more viscous can hold gas to a larger extent then a less viscous fluid, hence though a high viscous lav , though it would move slowly but in its interior it will carry lot of gas and energy, hence while after a initial build up when volcano will erupt it will throw the lava much higher and shell cover a wider area then low viscocity lava which will tend to flow on slope.
