When did the dinosaurs become extinct? What are the main causes of extinction?

The dinosaurs became extinct 66 million years ago, and the main reason for their extinction was probably due to planets hitting the Earth, followed by global volcanic eruptions. Now we see dinosaurs generally from books or some movies and television, TV series we can also know what dinosaurs look like, these are scientists after years of research, and archaeologists have also excavated a lot of dinosaur fossils.

In this way, it will help people to understand dinosaurs and other creatures, some of them are large and can fly in the air, and some dinosaurs are also very petite and have no attack power, anyway, there is no such thing as dinosaurs anymore, it is said that 66 million years ago, dinosaurs had a mass extinction.

All of them disappeared for a while, and some could be assumed to be due to an asteroid hitting the Earth.

Some people think it is due to the eruption of the earth's volcano.

Some things.

The extinction of the dinosaurs was 66 million years ago, and scientists proposed that an asteroid hit the Earth as a result. They assumed that if there were many asteroids hitting the earth 66 million years ago, and the diameter was still very large, it was possible to destroy all life in the world, after all, a lot of craters were found in Mexico now, scientists investigated and concluded that these craters were caused around 60 million years ago, according to various evidences to prove that a large number of asteroids did hit the earth 60 million years ago, so they came to the result that the asteroids hit the earth and caused the extinction of the dinosaurs.

More than 60 million years have passed since the extinction of the dinosaurs, and some scientists believe that the extinction of the dinosaurs was caused by the global volcanic eruption of the earth. It is said that after the asteroid hits the earth, it is said to have a shock wave because of the huge regulations.

The earth's crust cracks and squeezes the interior of the earth, and then volcanoes erupt directly, causing a large number of biological deaths.

I think the main reason for the demise of the dinosaurs is that something happened to the earth that caused the eruption, and the dinosaurs were burned to death in the magma of the eruption, or there is also a theory that the dinosaurs may have been electing who was the king, and only two dinosaurs were left, and the other dinosaurs died, and these two could have lost both of them, and they all died. The third theory is that it may be because of the movement of the earth's crust, causing the land to become the ocean, the ocean to the land, and the geographical location of the earth has changed. So the dinosaurs drowned in the ocean, and millions of years later, the fossils buried in the sand in the ocean became land because of the movement of the earth's crust.

Dinosaur fossils were shown on land, and all three of these theories are possible, what do you think?

The earth is the only planet with life known to mankind, the earth was born about 4.6 billion years ago, and then the earth began chemical evolution, to the proterozoic era about 100 million years ago, the earth began to show primitive life, bacteria may be the source of the evolution of life on the earth, and the earth began biological evolution.

The evolution of life on Earth has always followed the law from the lower to the higher, from the simple to the complex, and from the marine to the terrestrial. From an animal point of view, it has evolved from marine invertebrates, fish, amphibians, creeping animals to mammalsFrom the plant point of view, its development and evolution experienced the marine algae period, the terrestrial spore plant period, the fern period, the gymnosperm period and the angiosperm period. From the perspective of biological evolution, no species can exist forever, and biological extinction itself is an important part of biological evolution.

No creature can escape extinction, and the higher the creature's rank, the shorter it usually exists. Of course, some species gradually became extinct during evolution, and some species suddenly became extinct due to changes in the environment, such as dinosaurs. Dinosaurs were the overlords of creeping animals, living in the Mesozoic Era, including the Triassic, Jurassic, and Cretaceous periods, and the extinction of dinosaurs was about the end of the Mesozoic Era, about 65 million years ago, when about 45% of all species on Earth were extinct.

Scientists tend to coil around one of two hypotheses that could explain the extinction of the Cretaceous dinosaurs: an extraterrestrial impact, such as an asteroid or comet, or widespread volcanism. Both of these conditions can leave the sky clogged with debris that depletes the planet's solar energy, impedes photosynthesis, and causes destruction up and down the food chain.

Once the dust settles, the greenhouse gases locked in the atmosphere will cause temperatures to soar, and rapid climate change will wipe out most of the life that survives the prolonged darkness.

Sixty-five million years ago, the last non-avian dinosaur went extinct. The same goes for plesiosaurs in the ocean, as well as pterosaurs in the sky. Plankton, the very foundation of the marine food chain, has been hit hard.

Many brachiopod and sponge families have disappeared. The remaining hard-shelled ammonites are gone. The diversity of sharks has shrunk.

Most of the plants withered. Overall, more than half of the world's species are extinct.

The extinction of the dinosaurs was 65 million years ago. The main reason is that a large asteroid hit the earth, and the large amount of dust caused by the impact caused by the impact caused global climate changes, and a large number of animals and plants died.

The extinction of the dinosaurs occurred about 65 million years ago, and the reason for the extinction was because of changes in the earth's weather.

According to the book, the dinosaurs became extinct 66 million years ago. The main reason for their extinction, according to scientists, is largely due to the impact of planets on the Earth, and then the global volcanic eruption. After all, this is the only possibility that will lead to the extinction of large animals such as dinosaurs, and scientists have indeed found many craters.

The specific reason for the extinction of the dinosaurs is a controversial topic in the scientific community. It is currently believed that the main reason for the extinction of the dinosaurs may be the combination of a series of catastrophic events, including:

Large-scale volcanic eruptions: Large-scale volcanic eruptions can cause climate change, such as a drop in global temperatures, making it difficult for the sun's rays to penetrate the atmosphere, leading to the death of plants, disrupting the food chain, and having a significant impact on biological populations.

Changes in sea level: Paleontologists believe that at the end of the Cretaceous period, sea levels rose and seawater entered the land, causing floods that flooded the habitat of many dinosaurs.

Ocean acidification: Volcanic activity releases large amounts of carbon dioxide, which can form carbonic acid in water, leading to ocean acidification. Ocean acidification can have serious impacts on marine life, such as the growth of shellfish and corals.

Impact: Some scientists believe that a massive meteorite struck Earth about 65 million years ago, causing catastrophic consequences such as massive volcanic eruptions and climate change, which in turn led to the extinction of the dinosaurs.

In conclusion, the extinction of dinosaurs is a complex issue that may be the result of a combination of factors. With the development of science and technology, we will also have a deeper understanding of the causes of the extinction of dinosaurs.