Hidden role of garnet reveals how Earth's 660-km seismic boundary forms

PHYSorg
Jul 2, 2026, 1:00 pm308 ptsTop
Nearly 660 kilometers (410 miles) beneath Earth's surface lies one of the planet's most important internal boundaries. Known as the 660-km seismic discontinuity, it separates the mantle transition zone from the lower mantle and plays a central role in controlling how heat and materials circulate through Earth's…

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