Wells are bored and pathways are created inside hot rocks, into which cold water is injected.

ECONOMIST: Inside story: Hot rocks and high hopes | The

Despite being pelted by hot rocks, Mr. Mabao said he remembers looking after Sabine Strohberger, who nearly fell after stepping on a loose rock.

WSJ: Guides Recall Escape From Philippine Volcano

But, like Larderello, today's geothermal electricity comes from unique geologies, where hot rocks and underground water sit together, close to the surface of the earth.

FORBES: Looking For Energy, Google Goes To Hell

The news is reminiscent of the discovery made in Switzerland a couple of years back that pumping water deep into hot rocks to extract geothermal energy can also cause earthquakes.

FORBES: British "Fracking" Causes Earthquake -- What Now?

The AP wire story that was picked up by a number of publications last Friday went on to describe that the two campaigns responded like they had been handed hot rocks.

CENTERFORSECURITYPOLICY: Terror-free candidates

Right here on Earth, surprisingly hardy life-forms have been found inside hot underground rocks, around scalding volcanic vents at the bottom of the ocean, in desiccated Antarctic valleys and deep beneath polar ice.

FORBES: We've Got Company