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#earthhistory

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Chris Rowan

Modelling suggests that Earth's first crust, which fractionated from a magma ocean, would have had a similar trace element composition to modern continental crust: in other words, this signature is not a reliable marker of subduction and plate tectonics on the young Earth.

#geology #tectonics #EarthHistory

livescience.com/planet-earth/g

Live Science · Study reveals 'flawed argument' in debate over when plate tectonics beganBy Stephanie Pappas
Public
Chris Rowan

The protoplanetary material that coalesced to form the Earth had lots of intrinsic hydrogen bound with sulphur - probably enough to support hypothesis that Earth's water came from outgassing of mantle rather than being supplied by comets and asteroids.

#geology #planets #EarthHistory

earth.ox.ac.uk/article/scienti

www.earth.ox.ac.ukResearchers uncover crucial evidence for the origin of water on Earth
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tness

What distinguishes humans from animals? | DW Documentary
What made our ancestors evolve in such an extraordinary way? This film presents the latest scientific theories on how the human species evolved and looks at the shadow side of our unique abilities.

Some animals see, hear or smell better than humans. Others can find their way in the dark much better than we can. Some can fly. All animals communicate, some have excellent memories and others build complex structures and have highly-developed social skills.
So what sets humans apart? Why have humans evolved such highly developed cognitive abilities in comparison to animals? The documentary sheds light on this major question of human evolution -- one of the mysteries that has long puzzled the world of science. What is it that makes humans so fundamentally different from other animal species? And will our extraordinary abilities ultimately lead us to self-destruction?

#Documentary, #DWdocumentary, #fulldocumentary, #DW, #documentary2023, #dwdocumentary, #documentaries, #Documentaries, #documentary, #anthropology, #enigmaofhumanity, #brain, #neuroscience, #earthhistory, #humanbeing

youtube.com/watch?v=7qOfrz-M7-…

YouTubeWhat distinguishes humans from animals? | DW DocumentaryBy DW Documentary
Public
Hari Tulsidas

Complex life on Earth may be much older than previously thought. Fossils and geological evidence indicate that multicellular organisms might have existed over a billion years ago, pushing back the timeline of life's evolution. This discovery could reshape our understanding of how life developed on our planet, offering new insights into Earth's ancient history and the conditions that made life possible.

#Evolution #Paleontology #EarthHistory #LifeOrigins #Science

bbc.com/news/articles/c3geyvpx

Public
Chris Rowan

After the Great Oxygenation Event around 2.4 billion years ago, lots of now-unstable sulphide minerals like pyrite reacted with the oxygen now appearing in the atmosphere, making stream and river water extremely acidic - and apparently screwing up a proxy that has been used to argue that Proterozoic oxygen levels couldn't have been very high.

#geology #EarthHistory

eos.org/science-updates/how-gr

Eos · How Great was the “Great Oxidation Event”?By Aubrey Zerkle
Continued thread
Public
Fifi Schwarz 🖤🇪🇺 🍉✊🏿🌈🌍

One of the humbling takewaways from this book is how insignificant we human beings are - how brief our time on earth has been
compared to all of nature.

‘This is not our world with trees in it. It's a world of trees, where humans have just arrived.‘

To get a sense of how brief our time on earth is in light of all of earth's history - check out this fascinating video:
youtube.com/watch?v=S7TUe5w6RH

#Time #EarthHistory #HumanHistory #History #KurzGesagt

@bookstodon @boeken

Public
Matt Willemsen

Rethinking Earth’s Timeline: New Research Reveals That Fresh Water Emerged 500 Million Years Sooner Than Previously Thought
scitechdaily.com/rethinking-ea #geology #EarthHistory #Fres

SciTechDaily · Rethinking Earth’s Timeline: New Research Reveals That Fresh Water Emerged 500 Million Years Sooner Than Previously ThoughtRecent research led by Curtin University has discovered that freshwater appeared on Earth four billion years ago, suggesting that conditions for life developed significantly earlier than previously thought. New research led by Curtin University has uncovered evidence suggesting that fresh water, cr
Public
Hari Tulsidas

Plate tectonics, the process that shapes Earth’s surface, was surprisingly speedy in the past, a new study reveals. The study measured the speed of plate movements over the last two billion years and found that they were much faster than today, reaching up to 20 centimeters per year. Plate tectonics may have started earlier than previously thought, and that it may have influenced the evolution of life and climate.

#PlateTectonics #EarthHistory #Geodynamics

arstechnica.com/science/2023/0

Public
Matt Willemsen

Rewriting Earth’s Early History: Scientists Discover High Iron Oxidation in Primordial Magma
A new study shows that early Earth’s magma ocean was significantly more oxidized, leading to an atmosphere rich in CO2 and SO2. This could have hindered the formation of biomolecules, suggesting late accretion of reducing materials was crucial for habitability.
scitechdaily.com/rewriting-ear #EarthHistory #magma #oxidation #atmosphere #biology

SciTechDailyRewriting Earth’s Early History: Scientists Discover High Iron Oxidation in Primordial MagmaNew study sheds light on the composition of the Earth’s earliest atmosphere. Understanding the atmospheric and surface conditions of early Earth, especially before life originated, is crucial to comprehend Earth's ability to support life. The atmosphere of terrestial planets is believed to have bee
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Chris Rowan

The idea that we had no large, single- channeled meandering #rivers prior to rise of sediment-stabilising terrestrial #plants in the Silurian, only braided ones with multiple active channels, is not quite consistent with the geologic evidence for meandering systems much earlier in Earth history.

Apparently clay minerals can stabilise a channel enough on their own.

#geology #EarthHistory
eos.org/research-spotlights/mu

EosMud Could Have Made Meandering Rivers Long Before Plants ArrivedBy Rebecca Dzombak
Public
Matt Willemsen

Zircons Unlock Earth’s Early History: Life Sprung From a “Stagnant Lid,” Not Plate Tectonics
A study found that plate tectonics was inactive during the period when life first appeared on Earth. Instead, a “stagnant lid” mechanism was operating, releasing heat through surface cracks. This discovery challenges the traditional belief that plate tectonics is essential for life’s origination, potentially reshaping our understanding of conditions required for life on other planets.
scitechdaily.com/zircons-unloc #zircon #EarthHistory #tectonics #life #StagnantLid

SciTechDailyZircons Unlock Earth’s Early History: Life Sprung From a “Stagnant Lid,” Not Plate TectonicsA study from the University of Rochester, using zircon crystals, found that plate tectonics was inactive during the period when life first appeared on Earth. Instead, a "stagnant lid" mechanism was operating, releasing heat through surface cracks. This discovery challenges the traditional belief tha
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