Top Five Extinctions
Ordovician-silurian Extinction: 440 million years ago.
Devonian Extinction: 365 million years ago.
Permian-triassic Extinction: 250 million years ago.
Triassic-jurassic Extinction: 210 million years ago.
Cretaceous-tertiary Extinction: 65 million Years Ago.

Hi,

செத்து பொழச்ச பூமி JUST MISS | Dark Side of the Earth | பூமியின் வரலாறு
நம் பூமி உருவானபோ பல பேரழிவுகளை சந்தித்துள்ளது அதே போல் உயிரினங்கள் எப்படி உருவானது மற்றும் ஏற்பட்ட பேரழிவுகளால் உயிரினங்கள் எப்படி அழிந்தது , அனைத்தையும் நாம் இந்த பதிவில் தெரிந்துகொள்ளலாம்

Approximately 485.4 million to 443.8 million years ago. Here are some key points about the Ordovician period:

Sea Life: The Ordovician is known for the diversification of marine life. It saw the proliferation of various marine organisms, including trilobites, brachiopods, cephalopods, and early fish. Some of the first jawed fish appeared during this period.

Mass Extinction: Toward the end of the Ordovician period, there was a significant mass extinction event known as the Ordovician-Silurian extinction event. It is considered one of the Big Five mass extinctions in Earth's history

Continental Drift: During the Ordovician, the continents were positioned differently than they are today due to the process of plate tectonics.

Devonian extinction:

Timing: The Late Devonian extinction occurred over several million years, spanning the later part of the Devonian period. It's not a single, sudden event like some other mass extinctions.

Affected Organisms: The Devonian extinction primarily affected marine life. It had a particularly significant impact on marine organisms like corals, trilobites, brachiopods, and various types of jawless fish. Some groups, however, such as ammonoids, bony fish, and certain types of sharks, survived the extinction relatively unscathed.

Volcanic Activity: Intense volcanic activity could have released greenhouse gases into the atmosphere, leading to global warming and changes in ocean chemistry.

The Permian-Triassic extinction event, also known as the "Great Dying," is one of the most devastating mass extinctions in Earth's history. It occurred approximately 252 million years ago, marking the boundary between the Permian and Triassic periods. Here are key details about this catastrophic event:

Extent of Extinction: The Permian-Triassic extinction event is considered the most severe mass extinction event in Earth's history. It resulted in the loss of an estimated 90-96% of marine species and around 70% of terrestrial vertebrate species. It affected life on both land and in the oceans.

Volcanic Activity: One leading hypothesis is that extensive volcanic eruptions in an area now known as the Siberian Traps released massive amounts of lava and greenhouse gases. This led to significant global warming, acid rain, and changes in ocean chemistry, contributing to the environmental stress.

The Triassic-Jurassic extinction event is one of the five major mass extinctions in Earth's history, occurring approximately 201 million years ago, at the boundary between the Triassic and Jurassic periods. Here are key details about this extinction event:

Causes: The exact causes of the Triassic-Jurassic extinction are still debated among scientists, but several contributing factors have been proposed:

Volcanic Activity: Intense volcanic activity, particularly the eruption of the Central Atlantic Magmatic Province (CAMP), released large volumes of lava and greenhouse gases into the atmosphere. This led to global warming, ocean acidification, and changes in climate patterns.

Cretaceous-tertiary Extinction:
It occurred approximately 66 million years ago at the boundary between the Cretaceous and Tertiary (now known as the Paleogene) periods. Here are key details about this extinction event:

Extent of Extinction: The K-T extinction event resulted in the extinction of an estimated 75% of Earth's species, including many marine and terrestrial organisms. It is perhaps most famously known for causing the extinction of the non-avian dinosaurs.

Effects on Marine Life: Marine ecosystems experienced significant losses during the K-T extinction. Many marine reptiles, ammonites, and other marine species went extinct. Some groups, such as mammals, crocodiles, and some types of fish, survived the event.

நன்றி

Regards,
Vaan Veli
Santhosh

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460 கோடி ஆண்டுகளுக்கு முன் நம் பூமி உருவாகி அதன் பின் தற்போதைய நிலைக்கு மாறிய விளக்கம் இந்த காட்சியில் தமிழில் கூறப்பட்டுள்ளது . உங்களுடைய கருத்துக்களை கீழ் தெரிவிக்கலாம் நன்றி.






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History of our planet EARTH, 460 கோடி ஆண்டுகளுக்கு முன் நம் பூமி உருவாகி அதன் பின் தற்போதைய நிலைக்கு மாறிய விளக்கம் இந்த காட்சியில் தமிழில் கூறப்பட்டுள்ளது . உங்களுடைய கருத்துக்களை கீழ் தெரிவிக்கலாம் நன்றி.

Earth's formation (4.54 billion years ago): The Earth was formed from the dust and gas that surrounded the newborn Sun. The accretion process involved smaller particles colliding and sticking together to form larger bodies, eventually culminating to the formation of the Earth.

2. Hadean Eon (4.54 to 4 billion years ago): Earth was characterized by extreme heat and numerous asteroid collisions throughout this eon. The first oceans formed, and the atmosphere began to form.

Earth History in Tamil, Earth History, History of earth, How earth formed , History of our universe,

Regards,
Vaan Veli
Santhosh






#பூமிஉருவானவரலாறு #earth #human #history #earth, #universe #humanevolution #cretaceous #dinosaur #ourplanet #historyofearthtamil #evolution #பூமிஉருவானவரலாறு #earthhistory #earth #earthtamil #vaanveli #ulagam #earthhistoryintamil #earthhistoryanimation #earthdocumentary #moon #science #earthandmoon #earthandsun #extinsion #howtheearthwasmade #climatechange #whatif #dinosaurs #historyoftheworld #naturaldisasters #ourplanet #historyofearthtamil #humanevolutionexplained #vaanveli #vaan_veli #earthfacts #earthhistory #shorts

In this video, I'm going to show you the size and impact information about Asteroids in 3D that have fallen on our planet earth. I'll show you how to compare the size of different asteroids and how deadly they can be when they fall to Earth. This information can help you understanding the potential damage an asteroid could cause if it were to hit Earth.

This video is a great tool for learning about the dangers of asteroid collisions, and helping you to understand the impact that they can have on our planet. I'll also share with you some useful information about how to keep yourself and your family safe from potentially deadly asteroid falls!


நம் பூமியில் விழுந்த விண் கர்களின் அளவும் அதன் தாக்கம் பற்றிய தகவல்களை உங்களுக்கு 3D இல் காட்டியுளேன், வீடியோ பார்த்து மகிழுங்கள். உங்களின் ஆதரவுக்கு மிக்க நன்றி.

Regards,
Vaan Veli


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Hi,
டயனோசர்களின் கடைசி நொடிகள் | Last Moment of Dinosaurs #dinosaur #vaanveli

Impact Event: The most widely accepted theory is that around 66 million years ago, a large asteroid or comet, estimated to be about 6 miles (10 kilometers) in diameter, collided with Earth. This impact event is believed to have occurred in what is now the Yucatán Peninsula in Mexico and created the Chicxulub crater. The energy released in the impact would have caused massive fires, tsunamis, and a "nuclear winter" effect, with debris and soot blocking sunlight for an extended period.

Immediate Consequences: The impact would have caused massive wildfires across the globe, releasing a tremendous amount of soot and gases into the atmosphere. This would have led to a sudden drop in temperatures, making it difficult for many species, including the dinosaurs, to survive.

Climate Change: The impact and subsequent environmental changes caused by the impact led to a drastic cooling of the Earth's climate. This would have disrupted ecosystems, causing a decline in plant life, which, in turn, would have affected herbivorous dinosaurs and the predators that relied on them.

Mass Extinction: The combination of factors, including extreme temperature fluctuations, lack of sunlight, and ecological disruption, likely resulted in a mass extinction event. Many species, including the non-avian dinosaurs, went extinct during this time.

Surviving Species: While the non-avian dinosaurs went extinct, some groups of animals, such as birds, small mammals, and reptiles, managed to survive and eventually evolve into the diverse life forms we see today. Birds are the only living descendants of the dinosaur lineage.


Regards,
Vaan Veli
Santhosh



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டயனோசர்களின் தோற்றமும் மறைவும் | Evolution of dinosaurs #dinosaur #vaanveli #extinction

Origins and Early Evolution
Triassic Period (approximately 250-201 million years ago):
Archosaurs: Dinosaurs evolved from a group of reptiles called archosaurs. Early archosaurs appeared in the Triassic period, and from them, the first dinosaurs emerged.
Eoraptor and Herrerasaurus: Among the earliest known dinosaurs are Eoraptor and Herrerasaurus, small bipedal predators from South America, dating back to around 231 million years ago.
Major Dinosaur Clades
Jurassic Period (approximately 201-145 million years ago):

Saurischia: This group includes theropods (bipedal carnivores like Tyrannosaurus rex) and sauropodomorphs (long-necked herbivores like Brachiosaurus).
Ornithischia: This diverse group of herbivorous dinosaurs includes stegosaurs (Stegosaurus), ankylosaurs (Ankylosaurus), and hadrosaurs (duck-billed dinosaurs).
Cretaceous Period (approximately 145-66 million years ago):

Diversification: Dinosaurs reached their peak diversity during the Cretaceous. Major groups like ceratopsians (Triceratops) and theropods, which later gave rise to birds, flourished.
Bird Evolution: Theropod dinosaurs, particularly a group called maniraptorans, evolved into birds. The famous Archaeopteryx is often cited as a transitional fossil between non-avian dinosaurs and birds.
Extinction and Legacy
Cretaceous-Paleogene (K-Pg) Extinction Event (approximately 66 million years ago):
Mass Extinction: A catastrophic event, likely an asteroid impact, led to the extinction of most dinosaur species. However, avian dinosaurs (birds) survived and are their direct descendants.

Climate Change: The impact and subsequent environmental changes caused by the impact led to a drastic cooling of the Earth's climate. This would have disrupted ecosystems, causing a decline in plant life, which, in turn, would have affected herbivorous dinosaurs and the predators that relied on them.

Mass Extinction: The combination of factors, including extreme temperature fluctuations, lack of sunlight, and ecological disruption, likely resulted in a mass extinction event. Many species, including the non-avian dinosaurs, went extinct during this time.

Surviving Species: While the non-avian dinosaurs went extinct, some groups of animals, such as birds, small mammals, and reptiles, managed to survive and eventually evolve into the diverse life forms we see today. Birds are the only living descendants of the dinosaur lineage.

Adaptive Radiation: Dinosaurs adapted to various ecological niches, leading to a wide range of forms and sizes, from tiny, feathered theropods to enormous sauropods.
Feathers and Flight: Many theropods had feathers, initially for insulation or display, which eventually evolved for flight in the ancestors of birds.
Social Behavior: Evidence of social behavior, such as nesting sites and herd movement, suggests complex behaviors among some dinosaur species.


Regards,
Vaan Veli
Santhosh



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