Scientists say that there have been five civilizations on the earth, why have they all disappeared?

1. Ancient Pueblo Civilization: This civilization once dominated the Colorado Plateau, but the ancient Pueblo people abandoned their homeland in the 12th and 13th centuries. One of the most typical examples of the decay of civilization due to climate change has been the case with wars, human sacrifices and cannibalism, which scientists believe are closely related to climate change.

2. Khmer Empire: Founded in the 9th century, Angkor Wat was once one of the largest cities in Southeast Asia, and it was famous for its wealth and art. However, by the 15th century, the city was in decline due to a water crisis and ecological overexploitation caused by severe climate fluctuations. <>

3. Viking colonies in Greenland: In fact, Vikings discovered North America 500 years before Columbus, when they established colonies at the southern tip of Greenland for many years, but began to decline in the 14th century. Around the 14th and 15th centuries the world entered the "Xiaoice Age", which may have caused Viking to abandon the colony.

4. Indus Valley Civilization: Also known as the Harappan Civilization, the Bronze Age had a population of more than 5 million, with detailed urban planning and waterway systems, and Mohenjo-Daro and Harappa were the two famous cities of the civilization. Two centuries of severe drought led to the demise of the civilization.

5. Mayan civilization: The mysterious Mayan civilization declined in the 8th and 9th centuries AD. There are still some unsolved mysteries:

Great pyramids, palaces and meteorological observatories, etc. Scientists believe that the severe drought that lasted for 200 years and the dramatic changes in the climate eventually led to the disappearance of the Mayan civilization, rather than infectious diseases and foreign invasions.

The so-called five civilizations are the division of the stages of earth civilization by the Mayan culture, and it is believed that the current earth civilization is in the fifth solar age. Of course, there is little evidence for these prophecies in the Mayan culture. <>

The mainstream scientific community has always believed that there is no prehistoric civilization on the earth at all, and life on the earth has evolved slowly, from the simplest primitive cells, to the dinosaurs that dominated the earth, to the emergence of Homo sapiens, and human beings have reached the top of the earth's food chain.

Because everything can't escape the fate of extinction, these civilizations that disappeared on the earth show the extremely high wisdom of human beings, leaking many laws of the universe, and the cultivation of human character is not enough, so nature will not let such civilizations continue to develop rapidly, so they all disappeared in the end.

Other vanished civilizations are just legends, not civilizations at all, modern people still have a lot of confusion about the Mayan civilization, and now there are Mayans, there are Mayan languages, and they should really exist on the earth.

This statement is only hypothetical, there is no corresponding scientific basis, and even if there is, I think they are not disappearing, but they are integrated into our current culture.

Because of the continuous change of times, many civilizations are vulnerable to natural disasters.

Of course, there is no evidence for these prophecies in the Mayan culture, and it is impossible for scientists to divide the earth's civilizations based on the nonsense of the ancients. The mainstream scientific community has always believed that there is no prehistoric civilization on Earth at all, and that life on Earth has evolved slowly, from the simplest primitive cells, to the dinosaurs that ruled the Earth, to the emergence of Homo sapiens, and that humans are at the top of the Earth's food chain. Whether it is the legendary Atlantis or other legendary ancient civilizations, it is definitely the early form of human civilization.

What archaeologists refer to as prehistoric civilizations refers to the early forms of human civilization, which are usually just regional civilizations. Like the Mayan civilization, the ancient Egyptian civilization, etc., if you count these, there are not only five, but there are many in our country, Sanxingdui, Hemudu, etc., are all early forms of human settlement civilization. However, with the course of history, these regional tribal civilizations were eventually absorbed and assimilated by larger civilization groups, or due to changes in the environment, they could no longer survive in their original places, and in the process of migration, their scale gradually decreased, and eventually disappeared, which also made some connections between human languages and other languages.

There are thousands of languages in the world, but they are divided into only 9 major language families.

This is the result of natural selection of the survival of the fittest, other civilizations have been drowned in the long river of history, and only human civilization has survived.

Because the earth is constantly progressing, and civilization is constantly improving, natural selection, and survival of the fittest.

4 Great Civilizations.

Primitive civilization, marine civilization, dinosaur civilization, human civilization.

The earth has existed for hundreds of millions of years, but before the advent of humans, there was no civilization on the earth. Before the advent of human beings, there were many plants and animals on the earth, such as large plants and dinosaurs, which could not be called civilizations because they were unconscious. So why didn't the earth produce civilization before the advent of humans?

I am also very curious about this question, but I think that there was a civilization on the earth before the emergence of human beings, but due to the movement of the earth's crust or the impact of asteroids on the earth, this civilization has been covered, and this civilization cannot be explored with the current science and technology of human beings. Therefore, it is also believed that if human science and technology are better and can explore the mysteries of the entire earth, and even go deep into the center of the earth, then it is possible for human beings to discover that there have been civilizations on the earth before, and they will be able to realize that human beings are not the only intelligent creatures on the earth, and the earth also had civilizations before the emergence of human beings. However, this is just a speculation, maybe there was no civilization on the earth before the birth of human beings, because these creatures are unconscious, and they cannot know that tools cannot evolve at all, but can only become unconscious life.

Compared with other animals, human beings are not so strong or so good, but human beings are intelligent, so human beings can defeat many creatures, and become masters on this earth, so they can dominate other creatures. Therefore, consciousness is really very important, if one day machines or animals have consciousness, they may continue to evolve, they may become the masters of this earth, then human beings may also disappear on this earth. Therefore, there is no law to follow when things change, we can act under the existing laws, but if things change suddenly, we cannot change them.

Because the birth of civilization requires certain conditions, the social turmoil at that time was very large, and the development between species was not particularly stable, so some civilizations were not produced.

Because the previous environment was relatively harsh, all kinds of creatures were not civilized, and they ran around in order to survive, so no civilization was produced.

Because there were no humans a long time ago, animals did not evolve, and the environment was very harsh, so there would be no civilization.

Because the animals of the past had no mind, could not speak, and could not walk upright, there was no civilization.