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.






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

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






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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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1000 வருடத்திற்கு மேல் பூமியில் சூரிய ஒளி இல்லாமல் போனால் என்ன நடக்கும் தெரியுமா ? பூமியில் பெரிய எரி கல்லோ அல்லது பெரிய எரிமலையோ வெடித்தால் என்ன நடக்கும் என்பதை காட்டி உள்ளோம், அனைவரும் பார்த்து தங்களின் கருதுக்களை தெரிவிக்கலாம் நன்றி .

What If There was No Sunlight to Earth?

If there was no sunlight reaching Earth, the consequences would be catastrophic for life as we know it. Sunlight is essential for numerous biological and physical processes on our planet. Here are some of the major impacts:

Loss of Photosynthesis: Sunlight is crucial for photosynthesis, the process by which plants and some bacteria convert light energy into chemical energy to produce food. Without sunlight, photosynthetic organisms would be unable to survive, leading to the collapse of the entire food chain.

Ecosystem Disruption: The extinction of plants would result in the extinction of herbivores that rely on them for sustenance. This, in turn, would affect carnivores and other predators in the ecosystem. The disruption would likely cause a mass extinction event.

Temperature Drop: The Sun's energy is responsible for heating the Earth's surface. Without sunlight, the planet would rapidly cool down. The temperature drop would be drastic, leading to extremely cold conditions, especially in areas away from geothermal heat sources.

Loss of Atmospheric Circulation: Sunlight plays a crucial role in driving atmospheric circulation, which includes the formation of weather patterns and wind currents. Without sunlight, the atmosphere would become stagnant, resulting in the loss of weather systems and wind patterns.

Darkness: Obviously, the absence of sunlight would plunge Earth into darkness. The sky would be devoid of the typical blue color, and daylight-dependent activities would become impossible.

Disruption of the Water Cycle: Sunlight provides the energy required for the evaporation of water, which is an essential component of the water cycle. Without sunlight, the water cycle would slow down significantly, affecting rainfall patterns, freshwater availability, and overall climate stability.

Impact on Human Life: Humans, along with other organisms, depend on sunlight for vitamin D synthesis, which is crucial for bone health. The absence of sunlight would lead to widespread vitamin D deficiencies, resulting in health issues. Additionally, agriculture, which heavily relies on sunlight, would be severely affected, leading to food shortages and famine.

Regards,
VaanVeli



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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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Hi All,

The Chicxulub asteroid is a term commonly used to refer to the massive asteroid or comet impact that occurred approximately 66 million years ago. This impact is believed to be the primary cause of the Cretaceous-Paleogene (K-Pg) extinction event, which resulted in the extinction of about 75% of plant and animal species on Earth, including the dinosaurs.

The impact site is located near the town of Chicxulub in Mexico's Yucatan Peninsula. The asteroid or comet that struck Earth was estimated to be about 6 miles (10 kilometers) in diameter. The impact released an enormous amount of energy, equivalent to billions of atomic bombs, causing widespread devastation.

The impact triggered a chain of catastrophic events, including massive earthquakes, tsunamis, and wildfires. It also released an enormous amount of dust, soot, and vaporized rock into the atmosphere, blocking sunlight and causing a global cooling effect. The reduced sunlight led to a significant decrease in photosynthesis, disrupting the food chain and causing the extinction of many plant and animal species.

The Chicxulub impact left a distinct crater, which was discovered in the early 1990s through geological surveys and subsequent drilling. The crater measures approximately 93 miles (150 kilometers) in diameter and is buried beneath layers of sediment.

The study of the Chicxulub impact has provided valuable insights into the dynamics of large asteroid or comet impacts and their potential effects on Earth's ecosystems. It has also contributed to our understanding of the history of life on Earth and the mechanisms of mass extinctions.

The Chicxulub impactor, also known as the Chicxulub asteroid or the K-Pg asteroid, refers to a massive asteroid or comet that is believed to have struck the Earth approximately 66 million years ago. The impact of this asteroid is considered to be a significant event in Earth's history as it is widely associated with the mass extinction event that led to the demise of the dinosaurs and many other species.

Here are some key details about the Chicxulub impactor:

Size and Impact: The Chicxulub impactor is estimated to have been about 6 to 9 miles (10 to 15 kilometers) in diameter. When it struck the Earth, it unleashed an immense amount of energy, equivalent to billions of nuclear bombs.

Location: The impact site is located near the town of Chicxulub in the Yucatan Peninsula of modern-day Mexico. The region is known for a prominent crater, known as the Chicxulub crater, which was discovered in the early 1990s.

Extinction Event: The impact of the Chicxulub asteroid is widely believed to have caused or significantly contributed to the Cretaceous-Paleogene (K-Pg) mass extinction event. This event led to the extinction of approximately 75% of all species on Earth, including non-avian dinosaurs.

Environmental Effects: The impact generated a massive amount of heat, causing widespread wildfires and releasing enormous quantities of dust, ash, and gases into the atmosphere. This resulted in a global climate change event, with a significant drop in temperature and a reduction in sunlight reaching the Earth's surface. These changes severely disrupted ecosystems and led to the extinction of many plant and animal species.

Crater Formation: The impact created a crater that is approximately 93 miles (150 kilometers) in diameter and 12 miles (20 kilometers) in depth. Over time, geological processes and erosion have modified the original structure, but the remnants of the crater are still visible.

Discovery and Confirmation: The presence of a large impact crater in the Yucatan Peninsula was first proposed in the late 1970s. In the early 1990s, scientific drilling in the region provided evidence supporting the hypothesis that the Chicxulub impactor was responsible for the K-Pg mass extinction event.



Regards,
VaanVeli




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