On 7/24/2019 9:05 AM, The Starmaker wrote:
> So, as everyone knows...eventually the earth will stop turning.
>
> So does that mean there will always be a
> dark side of the earth?
>
> I guess that is where all the dark people will be living...
>
OK,,,, here is one citation.
But, since it's over 1 Billion years away,
I do not think humans need to fear.
https://www.forbes.com/sites/trevornace/2018/08/20/dont-worry-california-plate-tectonics-on-earth-will-halt-in-just-1-45-billion-years/#29f10de857d3
Don't Worry California: Plate Tectonics On Earth Will Halt In Just 1.45
Billion Years
Trevor Nace Senior Contributor
Science
The San Andreas Fault in the Carrizo Plain of California. WIKIPEDIA
Make sure you pencil this into your long-term calendar, estimates place
the death of plate tectonics here on Earth at 1.45 billion years from now.
The existence of plate tectonics on Earth makes it quite unique,
bringing with it a constant recycling of material and gasses, along with
the creation of mountains, earthquakes, volcanoes, and topography. Our
love/hate relationship with plate tectonics will come to an unfortunate
end according to a new study published in the journal Gondwana Research.
Qiuming Cheng, a geologist with the China University of Geosciences took
what we know about Earth's history and how plate tectonics has evolved
over the past several billions of years to project what we can expect
into the future.
The polynomial modeled result estimated plate tectonics would cease
around 1.45 billion years from now. The model sought out to determine
the future evolution of Earth's mantle, the driving mechanism for plate
tectonics. By examining the tectonic history of Earth, Cheng found that
both the intensity and periodicity of magmatic activities has declined
over the past 3 billion years, laying out a framework for the rate of
cooling within Earth's interior.
Global map of plate tectonics.
Global map of plate tectonics. USGS
By extrapolating how quickly Earth has cooled in the past, Cheng modeled
a nonlinear cooling into the future. The extrapolation placed the death
of plate tectonics in the year 1,450,002,018. While we clearly need not
worry about an event occurring over a billion years from now, scientists
can use our understanding of the impacts of a plate tectonic-less world
to study other planets.
What Would Happen If Plate Tectonics Stopped?
When plate tectonics does stop here on Earth, the world will quickly
(geologically) be a very different place than it is today. First, we can
all welcome the end of earthquakes and volcanoes as the mantle will be
too cool for molten rock to move beneath Earth's crust. As the plates
cease moving the world will essentially be frozen in time in its current
configuration, i.e. no more supercontinents, the opening of oceans, or
growing mountain ranges.
Erosion will become the primary factor in controlling Earth's surficial
features, grinding down mountains and sending that sediment into oceans.
Eventually, the tallest mountains on Earth will be eroded down to small
rolling hills. However, the mountains have not simply disappeared, they
were transported largely into Earth's oceans. This would cause oceans to
fill up with sediment to a much larger extent compared to today. The
filling of oceans by eroding mountains would cause sea level to rise.
This, in conjunction with the lack of mountains, could lead to flooding
across large expanses of continents. In essence, Earth could turn into a
water world.
Ocean
There are big question marks as to what Earth would do to release heat
from radioactive decay within Earth's interior. Currently, it does so
through plate tectonics and volcanism but if those cease, another avenue
of heat release would likely pick up. In addition, the regulation of
gases within Earth's atmosphere would change significantly as plate
tectonics is a primary factor in the recycling of carbon dioxide gas
from the atmosphere and into Earth's interior.
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Trevor Nace
I am a geologist passionate about sharing Earth's intricacies with you.
I received my PhD from Duke University where I studied the geology and
climate of the Amazon. I a... Read More