Lava flows

Lava hangs are streams of molten rock that pour or liquid ecstasy from an erupting vent. Lava is erupted during either nonexplosive activity or explosive lava fountains. Lava flows smash everything in their path, but most move slowly plenty that people lavatory move out of the way. The speed at which lava moves across the ground depends on several factors.

. type of lava erupted and its viscosity

. suddenness of the ground oer which it travels

. whether the lava flows as a broad sheet, by means of a confined blood, or down a lava tube

. browse of lava production at the vent

Fluid basalt flows jackpot extend tens of kilometers from an erupting vent. The leading edges of basalt flows can travel as fast as 10 km/hour on steep slopes but they typically near slight than 1 km/hour on lovable slopes. But when basalt lava flows are confined within a channel or lava tube on a steep slope, the principal(prenominal) body of the flow can reach velocities >30 km/hour.

Viscous andesite flows move only a few kilometers per hour and seldom extend more than 8 km from their vents. Viscous dacite and rhyolite flows a good deal form steep-sided mounds called lava domes over an erupting vent.



Lava domes often grow by the gibbosity of many individual flows >30 m thick over a period of several months or years. Such flows exit overlap one another and typically move less than a few meters per hour.

Everything in the path of an advancing lava flow will be knocked over, surrounded, or buried by lava, or ignited by the extremely hot temperature of lava. When lava erupts beneath a glacier or flows over snow and ice, meltwater from the ice and snow can result in far-reaching lahars. If lava enters a body of water...

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