MessageToEagle.com – Scientists have discovered two massive and mysterious blobs beneath the Earth’s surface.
The two structures, each the size of a continent and 100 times taller than Mount Everest lie deep within the Earth, roughly on opposite sides of the planet, under the Pacific Ocean on one side and beneath Africa and the Atlantic Ocean on the other.
Our planet is layered like an onion, with a thin outer crust, a thick viscous mantle, a fluid outer core and a solid inner core.
The blobs are made of something different from the rest of Earth’s mantle and the huge structures sit on the core, 1,800 miles deep, and about halfway to the center of the Earth. For now it remains unclear what these structures really are, but scientists suspect they hold important clues as to how Earth was formed and how it works today.
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According to Edward Garnero from the Arizona State University, the blobs, may not only cast more light on the Earth’s formation, but they can also help explain the plumbing that leads to some massive volcanic eruptions, as well as the mechanism of plate tectonics from the convection, or stirring, of the mantle. This is the geo-force that drives earthquakes.
Credit: Dr. Mingming Li/University of Colorado
Waves from earthquakes passing through Earth’s deep interior have revealed that these blobs are regions where seismic waves travel slowly. The mantle materials that surround these regions are thought to be composed of cooler rocks, associated with the downward movement of tectonic plates.
Much is yet to be learned about these blobs. But the emerging view from seismic and geodynamic information is that they appear denser than the surrounding mantle materials, are dynamically stable and long-lived, and have been shaped by the mantle’s large-scale flow. The scientists expect that further work on the two deep-seated anomalies will help clarify the picture and tell of their origin.
Scientists now hope a detailed study of the thermochemical piles will cast more light on these features fit into the big puzzle of planet Earth.
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