Our Earth is the only planet of
Solar system where conditions are suitable for the existence of life. The air,
water, soil, light, and Suitable temperature on the Earth provide basic
requirements for living environment. The growth of all living creatures on the
earth is possible due to them. But what is the inner side of the Earth? What is
the purpose they serve? And what do they impact on the living beings if they disturbed?
According to geologists, the parts of an egg resembles exactly the inner
structure of the earth. The rent of the egg is like crust, white part is like mantle
and the yolk is like core of the earth.
The outer crust covered with
mountains, rivers, oceans, and Greenfields. The thickness is around 5 Km to 70 Km.
Even beneath the ocean, its thickness is about 5Km. The biggest part of the Earth,
Mantle, have thickness of 3,900 Km. The core itself divided into two parts: internal and external core. Being the
center of the Earth core has 5000oC temperature. The internal core
is completely solid while the external core is in liquid state and consist of
iron and Nickle. The solid inner core is separated from the Mantle through
liquid. That is why it allows the core, which is the size of Mars, to rotate
freely.
Recently, research was published
by Yi Yang, associate research scientist at Peking University, and Xiaodong
Song, Peking University chair professor in the journal Nature Geoscience.
They examine seismic waves from earthquakes, passed through the Earth’s inner
core since the 60s to deduce how fast the inner core is spinning.
They found an unexpected pause in the inner core’s rotation.
There findings show little difference with the back in 2009 seismic record.
They wrote in the study.
“We show surprising observations that indicate the inner core has nearly ceased its rotation in the recent decade and may be experiencing a turning-back,”
“When you
look at the decade between 1980 and 1990 you see clear change but when you see
2010 to 2020 you don’t see much change,”
The rotation of the inner core depends
on the magnetic field made by the external core and balanced through the Mantle’s
effect. Hence these layers’ interaction leads to numerous processes beneath the
Earth. However, the rotation speed and its variation is still debatable because
the findings shows that the inner core doesn’t stop completely but it actually
tells that the decade ago the core’s spinning speed was faster than today’s speed.
We should be alarmed or not?
This report comes not from
Hollywood. It comes from reputable scientists at Beijing University that
analyze echoes. When an earthquake takes place, shock waves go reverberating
around the inside of the earth, and by analyzing these echoes with computers,
you can recreate a model of the inside of the earth. And sure enough, the core
seems to be about to spin backwards.
The question raises here that,
whether we should be alarmed or not? The answer is we know little about the
Earth’s core. Very little about what's underneath their feet. The good news is
probably there's nothing to worry about. In the sense that every 70 years or so
the center of the earth does seem to go backwards. The core could move
independently of the crust.
Conflicting observations over the speed of Earth’s core Rotation
Famous author Tkalcic, who wrote “The Earth’s Inner core: Revealed
by Observational Seismology,” said that study’s “data analysis is good.” Though,
the study’s findings “should be taken carefully” as “more data and innovative
methods are needed to shed light on this curious problem.”
He reserved the entire chapter over the rotation of Earth’s
inner core. His suggestions, 20 to 30 years are opposing to the 70 years of
core’s cycle projected in the latest study. He answers about variations and
tells the difficulty in understanding of the events happening deep in the
Earth.
He said.
“The objects
of our studies are buried thousands of kilometers beneath our feet.”
He also explained.
“We use
geophysical inference methods to infer the Earth’s internal properties, and
caution must be exercised until multi-disciplinary findings confirm our
hypotheses and conceptual frameworks.”
“You can think
of seismologists like medical doctors who study the internal organs of
patients’ bodies using imperfect or limited equipment. So, despite progress,
our image of the inner Earth is still blurry, and we are still in the discovery
stage.”
Implications
The implications are immense because think of continental
drift. Why are the continents moving away from each other? What is driving it? And,
earthquakes, the whole nature of the stability of the planet itself. We know little
about what's underneath our feet, and that is why this information from echoes,
computer analyse it, is very important because it tells us the future of the
Earth. We do not know that much about our home. We know more about other
planets than we do about the center of the Earth. Like Mars, for example, is
probably frozen over; not much earthquake activity at all, so we know a fair
amount about Mars. We know very little about the earth because the earth is
dynamic. Things are moving and shaking at the centre of the Earth. That is why earthquake,
continental drift and volcanoes occurs.
