Why is it in the News?

Recently, an international team of scientists found a new mysterious layer called the E prime layer on the outer part of the Earth's core.

About the E Prime Layer:

• Before, it was thought that there's only a small exchange of materials between the Earth's core and mantle.
• However, experiments showed that when water reaches the boundary between the core and mantle, it reacts with silicon in the core and creates silica.

Development of this Layer:

• New research proposes that over billions of years, tectonic plates carrying surface water transported it deep into the Earth.
• When this water reaches about 1,800 miles below the surface at the core-mantle boundary, it triggers significant chemical changes, affecting the core's structure.
• Scientists observed that under high pressure, subducted water chemically reacts with core materials.
• This reaction forms a hydrogen-rich, silicon-depleted layer on the outer core, resembling a film.
• Silica crystals produced in this process rise and mix into the mantle, impacting the overall composition.
• Changes in the liquid metallic layer could potentially lead to reduced density and altered seismic characteristics, consistent with anomalies detected by seismologists.

Importance of this Discovery:

• This finding deepens researchers' understanding of the Earth's internal workings, revealing a more extensive and complex global water cycle than previously known.
• The altered core layer has significant implications for the interconnected geochemical processes that link surface water cycles with the deep metallic core.