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Drill digs deeper than ever into Earth's crust

点击量:   时间:2019-03-02 12:01:01

SINCE the 1950s, people have dreamed of drilling through the Earth’s crust to the mantle. We are now a step closer, having reached the “gabbro” layer of oceanic crust for the first time. About 60 per cent of the Earth’s surface is covered in oceanic crust, but there are still many questions about how it forms. Gabbro, a coarse-grained rock that forms as trapped magma slowly cools, might hold some of the answers. To get their hands on some of the stuff,