Discovery Of Gigantic Ocean

Discovery Of Gigantic Ocean

Why In News:

Amid water crisis, scientists discover gigantic ocean beneath Earth's surface; say, 'like sponge, soaking up water'.. The findings were first published in the ‘Science’ magazine in 2014 titled 'Dehydration melting at the top of the lower mantle'. The study also presented the unique properties of ringwoodite.

Science Behind The Discovery:





§    Amid a large number of countries suffering from severe water crisis the quest for finding more sources of the water has led the researchers from Northwestern University, Illinois (the US) to discover a gigantic reservoir of water that is three times the size of Earth's oceans combined, 700 km beneath the planet's surface in a rock known as ringwoodite.

§    The researchers are of the view that this hidden ocean beneath the surface, concealed within a blue rock known as ringwoodite, is probably the primary source of water on Earth’s surface. The size of this subterranean ocean is triple the volume of all the planet’s surface oceans combined.

§    "The ringwoodite is like a sponge, soaking up water, it has Special character like the crystal structure of ringwoodite that allows it to attract hydrogen and trap the water.

§    It will give  evidence for a whole-Earth water cycle, which may help explain the vast amount of liquid water on the surface of our habitable planet.

§    To uncover this underground ocean, researchers used an array of 2000 seismographs across the United States, analysing seismic waves from over 500 earthquakes. Waves which travel through Earth’s inner layers, including its core, slow down when passing through wet rock, allowing scientists to assume the presence of this vast water deposit.

§    "The high water storage capacity of minerals in Earth's mantle transition zone (410- to 660-kilometer depth) implies the possibility of a deep H2O reservoir, which could cause dehydration melting of vertically flowing mantle. They examined the effects of downwelling from the transition zone into the lower mantle with high-pressure laboratory experiments, numerical modelling, and seismic P-to-S conversions.

 

 




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