Viscosity for a particular substance gets lower as the temperature increases, but one substance may have a much different viscosity from another substance at the same temperature. For instance, honey is more viscous than water at room temperature. The viscosity will go down for both liquids as temperature increases, but the honey will still be more viscous than the water.
Lava happens to be very viscous even when very hot. But still, its viscosity will get smaller when the temperature goes up.
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