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Steam from underground sources is called geothermal steam. By drilling, you may extract steam that was otherwise not available, and use it to turn electric generators in the usual way.

The Geothermal steam is also used as process heat in nurseries, and as a heat source for heavy industry such as papermaking.

The steam from underground often contains excessive quantities of arsenic, and the spent water must be re-injected into the ground. The steam also contains large quantities of silica, which would be very abrasive to machinery if care were not taken to remove it before the steam passes through the turbine.

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