How strong is basalt

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Basalt. Basalt is a hard, black volcanic rock with less than 52 silica. Because of this low silica content, basalt has a low viscosity (thickness), and so it can flow for long distances after erupting from a volcano. During an eruption, a basalt lava flow can easily move more than 20 km away from a vent.

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Updated: 2019/10/18

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