Volcanos billow out smoke, ash, dust, gases, and lots of lava when they erupt. Therefore, what if we could tap into that stuff for human purposes? For instance, if we could create a machine out of very high resistant material that can withstand temperatures exceeding 11,000 degrees Fahrenheit, we could manufacture houses out of the lava before it hardens into a cooled down solid slab. Another example, the gases could be collected to produce biofuels for motor vehicles or to power our homes. And the ash and dust could be crushed and churned with asphalt or cement to form a more sturdier formula for building sidewalks, buildings, and streets.
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