These anomalies are surprisingly similar to sunken chunks of Earth's crust but appear in seemingly impossible places. Potential patches of Earth's ancient crust, sometimes called "sunken worlds ...

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Earth is unique amongst the rocky planets in having two very different types of crust. Continental crust is composed primarily of silica-rich rocks like the granite of your kitchen countertops.

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7. “With the new high-resolution model, we can see such anomalies everywhere in the Earth’s mantle. But we don’t know exactly what they are.” The anomalies may be ancient subducted slabs—fragments of ...

Advert They can be found about 1,200 miles (2,000km) below the Earth's crust, and are said to be at least half a billion years old. It is suggested that they could be a more significant part of ...

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