A 2023 study measuring up-to-fivefold reverberating PKIKPs (pee-kay-eye-kay-pees) gave evidence for this region's innermost anisotropic (an-ICE-uh-trop-eck) zone. Recent simulations predict this region has atoms such as oxygen and sulfur flowing in a superionic fluid, and a 2015 study found that this region contains 90 percent of the planet's sulfur. This region lies below a discontinuity named for either Keith Edward Bullen or Inge Lehmann (een-guh LAY-mahn); Lehmann discovered this region by observing its reflection of certain body waves. About a millimeter of material is deposited yearly onto this region, driving convection in the layer above this region to create a geodynamo. A 2023 study discovered this region had stopped super-rotating, causing it to ■END■
ANSWER: Earth's inner core [prompt on Earth's core]
<June Yin , Science - Earth - any>
= Average correct buzz position