: A billion-year history of Earth’s interior shows it has changed shape more than previously thought #IndiaNEWS Deep in the Earth beneath us lie two blobs the size of continents. One is under Africa,

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A billion-year history of Earth’s interior shows it has changed shape more than previously thought #IndiaNEWS
Deep in the Earth beneath us lie two blobs the size of continents. One is under Africa, the other under the Pacific Ocean.The blobs have their roots 2,900 km below the surface, almost halfway to the centre of the Earth. They are thought to be the birthplace of rising columns of hot rock called “deep mantle plumes� that reach Earth’s surface.When these plumes first reach the surface, giant volcanic eruptions occur – the kind that contributed to the extinction of the dinosaurs 65.5 million years ago. The blobs may also control the eruption of a kind of rock called kimberlite, which brings diamonds from depths 120 km-150 km (and in some cases up to around 800 km) to Earth’s surface.Scientists have known the blobs existed for a long time, but how they have behaved over Earth’s history has been an open question. In new research, we modelled a billion years of geological history and discovered the blobs gather together and break apart much like continents and supercontinents.Earth blob evolutionThe blobs are in the mantle, the thick layer of hot rock between Earth’s crust and its core. The mantle is solid but slowly flows over long timescales. We know the blobs are there because they slow down...Read more

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