sink into

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Material from the upper mantle could not sink into the lower mantle, otherwise that mixing would homogenize the two regions within a fraction of Earth's history - thus wiping out the density difference, he says.
The work by van der Hilst and Fukao suggests that all plates were not created equal, Some slabs bend when they reach the 650 km boundary and remain in the upper mantle; others sink into the lower mantle.
Slabs encounter resistance at the 650 km depth but eventually they penetrate through that boundary and sink into the lower mantle at slow velocities," he says.