What is the reason for the extinction of the dinosaurs, about 40 words?

There are many theories about the reasons for the extinction of dinosaurs: 1. Meteorite impact theory; 2. Climate change theory; 3. Volcanic eruption theory.

1. Volcanic eruption theory.

Sixty-six million years ago, an asteroid landed on Mexico's Yugatan Peninsula, causing the mass extinction of the dinosaurs. 100,000 years later, the volcano in the Deccan Plateau in India began to erupt large amounts of magma, and a prolonged volcanic eruption could once again cause mass extinctions on Earth.

2. The asteroid hit the earth.

65 million years ago, meteorites struck the Earth, producing dust that obscured the sky and caused climate upheaval, causing plant deaths and dinosaurs suffering from lack of food.

3. Climate change theory.

65 million years ago, the Earth's climate changed dramatically, and the temperature dropped dramatically, causing the atmospheric oxygen content to drop, making it impossible for dinosaurs to survive. It is also believed that dinosaurs were cold-blooded animals with no hair or warm organs, unable to adapt to the drop in the earth's temperature, and were frozen to death.

Dinosaurs are a general term for a class of reptiles that appeared during the Mesozoic Era (Triassic, Jurassic and Cretaceous), with vigorous limbs, long tails and huge bodies that most dinosaurs portray. They mainly inhabit woodlands or open areas on lakeshore plains (or coastal plains). They used to be land overlords, dominating the Earth's surface for hundreds of millions of years.

Alfretz, a physics professor from the United States, believes that 65 million years ago, a huge asteroid hit the earth, causing a large amount of dust to drift in the sky and block the sun. This went on for years, so that the dinosaurs could not get enough heat from the sun and the plants could not photosynthesize, so the dinosaurs became extinct. "Meteorites hit the earth" is also the reason for the extinction of dinosaurs that most scientists currently recognize.

The extinction of the dinosaurs is something that we all know. But in fact, the Earth has experienced five major extinction events, in turn in the Ordovician, Devonian, Permian, Triassic and Cretaceous. For example, the extinction in the Permian caused the disappearance of 95% of the species on the planet at that time, "with heavy losses".

There are many causes of mass extinctions, including global warming, global cooling, sea level changes, drastic reductions in ocean oxygen, infectious diseases, volcanic eruptions, meteorite and comet impacts, and more.

Writing a short essay on dinosaur extinction should first put forward your own opinion, and then make a specific analysis around the viewpoint, the following is an example of a short essay on dinosaur extinction:

One popular theory as to why the dinosaurs went extinct was that an asteroid hit Earth about 66 million years ago. And two studies published by the American journal Science on March 20, 2019 believe thatTogether, asteroid impacts and massive volcanic eruptions led to the extinction of dinosaurs and other Mesozoic animals.

Researchers have found that a series of volcanic eruptions occurred on Earth around the time of the impact, and the Deccan plateau in southern India today had four strong volcanic eruptions during that period.

One of them occurred before the asteroid impact, which means it wasn't the asteroid impact that triggered the eruption. It is not clear how an asteroid impact compares to a volcanic eruptionThe extent to which it led to the mass extinction of dinosaurs and other creatures.

Researchers believe that the massive amount of magma spewed out by the volcano may have wiped out life in the vicinity. Volcanic eruptions eject large amounts of sulfur-containing gases, carbon dioxide, etc., into the atmosphere.

Sulfur-containing gases cool the atmosphere in the short term, while carbon dioxide, methane, etc., warm the planet in the long term. This kind of climate fluctuation caused by volcanic eruptions has made the living environment on the earth harsh, which is one of the causes of the extinction of the dinosaurs.

In 1980, American scientists Alfretz and his son discovered high concentrations of iridium in strata 65 million years ago, which exceeded the normal content by tens or even hundreds of times. Such concentrations of iridium can be found in meteorites, so scientists have linked it to the extinction of the dinosaurs. According to the content of iridium, it is also calculated that the impact object is an asteroid with a diameter of about 10 kilometers, and the impact of such a large meteorite on the earth is an unparalleled blow, calculated by the strength of **, about 10 on the Richter scale, and the crater produced by the impact will be more than 100 kilometers in diameter.

It took scientists 10 years to finally get the first results, and they found the crater in the strata of the Yucatan Peninsula in Central America. It is estimated that the diameter of this pit is between 180-300 km. In 2000, scientists were still doing further research on the pit.

Now that the crater has been found and scientists have some evidence of it, the mystery of the extinction of the dinosaurs seems to be settled.

An asteroid hits the Earth! ❤️balalala~／

Great.

Bu

65 million years ago, a meteorite fell on the earth, so the dinosaurs became extinct.

What was the main reason for the extinction of the dinosaurs?

Very simple! The dinosaurs themselves have already told us how they became extinct?

The first impression of dinosaurs is that they are massive. The sheer size tells us that they have to eat a lot of food every day, and that the food is not grown by the dinosaurs themselves. Rather, they depend on the sky for food.

The larger the dinosaurs, the more dependent they are on the climate, which means that they are more and more vulnerable to the natural climate!!

The climate has changed, and the dinosaurs have been eliminated! After the extinction of the dinosaurs, there were no such large land animals on the earth, that is, there was no such climatic environment. In other words, after the death of the dinosaurs, the earth has a different climate!!

So what is it that has so much energy to change the climate of the earth? It's the moon. The moon has entered its current orbit, turning the climatic environment of the dinosaurs into our current climatic environment!

The big ones were eliminated, and one evolved into a bird! The fact that a very small dinosaur has feathers on its body is a strong proof that the environment has become colder!! The above is my original personal opinion!

There are many theories: for example: planets hit the earth, mammals steal dinosaur eggs, the sun is in a small range for a short time**, and dinosaur eggs can only pay male small dinosaurs when global temperatures drop, etc.

The extinction of the dinosaurs was a long time ago, so I won't say it, let those who know say it...

What was the main reason for the extinction of the dinosaurs?