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| A lava flow is a molten river of melted rock. Lava flows do not come from explosive eruptions, but they just pour out of the top of a vent slowly. Lava flows burn and destroy everything in their paths. How fast lava flows depends on what the lava is made up, how steep the ground is, how much lava is flowing from the vent, and how wide the flow is. Basalt flows are thin enough to flow quickly for a long distance. Lava flows made up of andesite move very slowl and is called viscous because it is very thick. Viscous lava flows so slowly that lava domes can form over the mouth of a vent. | ||||||||||||||||||||||||
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