Volcanoes eject huge clouds of sulfur dioxide ... he said. This is where diamonds could come in handy, Vattioni said. In a modeling study published in October, he and colleagues found that ...

That is, they were crafted deep within the Earth, 100 to 300 miles down, when intense heat and pressure transformed carbon into diamonds, which volcanic eruptions then lofted to the surface.

A diamond unearthed in a diamond mine in Botswana ... Over time it makes its way back to the surface via volcanic activity. This slurp-down, spew-out cycle is known as the deep water cycle ...

eg diamonds - this can be mined to make money Volcanic bombs and heat clouds, with temperatures up to 800°C, spread over a distance of 10 kilometres. Pyroclastic flows travelled three kilometres ...