Strange volcanoes called kimberlites bring diamonds up from Earth's depths. Scientists have always struggled to understand why they switched off millions of years ago – but perhaps they didn't.
Why supersonic, diamond-spewing volcanoes might be coming back to life

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https://www.newscientist.com/article/mg26134830-100-why-supersonic-diamond-spewing-volcanoes-might-be-coming-back-to-life/