Why did dinosaurs die and why dinosaurs died

There is no way to know, but there are a number of hypotheses:

1. The hypothesis that an asteroid hits the earth: an asteroid hits the earth, causing a large amount of dust to obscure the earth's atmosphere, causing animals to freeze or starve to death at that time. (the more common way of saying it is now).

2. Volcanic eruption hypothesis: At the end of the Cretaceous period, there was a volcanic eruption, and the violent volcanic activity sprayed a large amount of volcanic ash, sulfate, and carbon dioxide into the atmosphere, blocking the sunlight, and the climate was cold, which caused the dinosaurs to perish.

3. Climate change hypothesis: the Jurassic humid and hot, almost perennial temperature remained unchanged until the Cretaceous global natural environment deteriorated, the climate seasonality was obvious, the temperature difference between day and night became larger, and the warm and humid climate zone gradually shrank, leading to the extinction of the dinosaurs.

4. Food poisoning or scarcity hypothesis: In the late Cretaceous period, plants were replaced, so that dinosaurs could not eliminate plant toxins in the process of changing food, resulting in their death. At the same time, it is not excluded that the dinosaur population is less fertile due to lack of food to reduce the pressure on the population.

5. Ocean change hypothesis: Since the middle of the Cretaceous, the separation and drift of continental plates have accelerated significantly, the ocean circulation has become more complex, and the crustal movement has intensified, causing the sea to retreat and the temperature to rise, leading to the extinction of the dinosaurs.

No one knows the real reason. Although scientists continue to put forward many hypotheses to explain, but there is no sufficient evidence, and these assumptions are also irrational, so we can only solve this age-old mystery by looking forward to newer and more conclusive evidence.

Now, let's take a look at what is being said:

New species are rising. The number of mammals increased, and the dinosaurs were eaten up by eating up the eggs, and the dinosaurs became extinct.

A lot of radiation. The sudden increase in ultraviolet rays from the universe caused the death of the dinosaurs.

Land blocks move. Land masses around the world are becoming separated, orogenys are on the rise, and sea levels are rising, reducing dinosaur habitat and becoming extinct.

Volcanic eruptions. The eruption of the volcano caused a large amount of soot and acidic substances to seep into the atmosphere, which not only made the earth dark, but also produced acid rain, destroyed the ozone layer, and caused the death of the dinosaurs.

Meteorite collisions. A huge meteorite hit the Earth, raising a cloud of wind and sand, obscuring the entire Earth. Soon after, the temperature dropped, and the dinosaurs, unable to protect themselves, began to die one after another. The originally warm temperature began to drop, the four seasons gradually became distinct, and the huge dinosaur could not adjust its body temperature in time and froze to death.

The death of dinosaurs from an asteroid impact 65 million years ago is a major discovery in the history of science, although we have sufficient evidence that dinosaurs died from asteroid impacts and the environmental upheaval caused by the impact, but there are still researchers who believe that asteroids are only one of the influencing factors, and there are other deeper reasons for the extinction of dinosaurs. American scientists have found evidence of the extinction of the dinosaurs near the Deccan shield in India, and the results show that the extinction of the dinosaurs was not only caused by asteroids, but also by volcanic eruptions affecting the Earth's environment. About 250,000 years before the asteroid hit Earth, there was a massive volcanic eruption on Earth, and in the next 500,000 years or so, the Earth's environment changed dramatically.

An asteroid with a diameter of 8 kilometers hit the earth, causing a large amount of dust to block the sun's illumination, resulting in a series of catastrophic events, such as a large number of green plant deaths affecting the survival of herbivorous dinosaurs, and the mass death of small animals also led to the extinction of carnivorous dinosaurs. Now researchers in the United States have found more evidence that there was a large-scale volcanic eruption on Earth before the asteroid impact, which also contributed to the extinction of the dinosaurs, because the large-scale volcanic eruption caused some volatile chemicals to reach dangerous levels, the Earth's atmosphere became turbid, and the asteroid impact further established the fate of the extinction of the dinosaurs.

Scientists are exploring the Deccan Rock Group in India's central west, where traces of the largest volcanic eruption on Earth are preserved, and researchers are looking for zircon, a uranium-bearing rock mineral that forms after a magma eruption and can be a very precise indicator of an eruptive event. The researchers collected more than 50 samples from the area and found the presence of zircon in the bottom and top layers of volcanic rock, from which scientists determined when the eruption of the volcanic group began and ended. The results show that 250,000 years before the asteroid impact, there was a large-scale volcanic eruption on Earth, which lasted for 500,000 years, and scientists at MIT and Princeton University calculated that the volcano spewed out lava in square kilometers.

Large-scale volcanic activity has increased the amount of dangerous chemicals in the atmosphere, polluting the atmosphere and the marine environment, and Michael Eddy of the Massachusetts Institute of Technology believes that if our eruption model is correct, then a large amount of carbon dioxide emissions spread very quickly in the atmosphere, a factor that may have played a major role in the extinction of the dinosaurs.

Because the extinction of the dinosaurs was concentrated in a very short period of time, it caused a lot of discussion.

There are several points of view that are more popular:

1. Meteorite said. Some scientists speculate that the Earth has been hit by a huge meteorite. Meteorite impacts killed a large number of dinosaurs, and then brought long-term dark clouds, which made the dinosaurs short of food and many dinosaurs extinct.

2. Temperature change theory. Among the dinosaur egg fossils found during the extinction of the dinosaurs, many dinosaur egg shells were found to be very thin. It could not support the hatching of young dinosaurs, and it was also more prone to breakage. Scientists believe that this was caused by the drastic changes in the weather at that time.

3. Alien Theory. This theory is mainly found in a small number of scientists, who are based on the fact that many of the dinosaur fossils found had regular holes and that most of the dinosaurs were very concentrated when they died. It is believed that dinosaurs were hunted in large numbers by aliens and the like.

There are also some points that I don't remember very clearly. I'll talk about it when I think about it.