Add Yahoo as a preferred source to see more of our stories on Google. Giant's Causeway in Northern Ireland features around 40,000 exposed polygonal columns of basalt in perfect horizontal sections.

Basalt is a common gray to black volcanic rock. It is usually fine-grained due to rapid cooling of lava on the Earth's surface. It may be porphyritic containing larger crystals in a fine matrix, or ...

What if there was an easy way to take the carbon dioxide from coal power smokestacks and turn it back into a rock that would sit quietly, deep below the earth's surface? That would get around a key ...