volcanic

Naples sits on the Phlegraean Fields, a volcanic basin that makes the area in southern Italy prone to quakes.

The petroglyphs can be found on volcanic tuff formations formed over 760,000 years ago when a large eruption released hot ash that settled over the region.

Let's be clear: Reform UK are not unique when it comes to volcanic rows – just ask the Conservatives or Labour within the last decade.

Along with volcanic ash, his brain and spinal cord were found to contain a mysterious archeological treasure: tiny, gleaming shards of black glass.

Indeed, this mineral exists on our planet, often in volcanic settings such as lava caves.