At present, there was no conclusive evidence that there was a civilization other than human civilization on Earth. From the excavation of the geological stratum, no traces of the ancient civilization were found. No super-architectural relics left behind by the ancient civilization were found. No traces of large-scale coal mining (except for humans) were found. No satellites left behind by the ancient civilization's spacecraft were found. Although some people assumed that Earth might have produced at least two civilizations in the past 4.5 billion years, such as the ancient civilization and the human civilization, it seemed that there was no ancient super civilization from many analytical perspectives. However, there was also a point of view that before the emergence of humans, Earth's civilization might have been formed and destroyed many times, but there was insufficient evidence to prove this. The novel "High Martial Era" is equally exciting. Everyone is welcome to click and read it!

Prehistoric civilization refers to the various prehistoric human civilizations that exist on Earth. Their existence has not been generally recognized by the scientific community and is still a controversial topic. Some scholars and researchers raised the possibility of prehistoric civilizations. They believed that Earth's history was very long and complicated, and it might have experienced the development and destruction of many different civilizations or humanoid civilizations. They pointed out some clues or evidence that were considered prehistoric civilizations, such as the Mayan civilization, the Egyptian pyramids, the Hanging Gardens of Babylon, and other relics or relics that exceeded the level of human technology at that time. There were also footprints on trilobites, nuclear reactors in Africa, Baghdad batteries, and so on. However, there were also many phenomena that were proven not to be the remains of prehistoric civilization. For example, the ancient murals in southern Spain 65,000 years ago. Although there were no Homo Evolutis in Europe at that time, no prehistoric civilization sites or ruins were found. At the same time, according to legend, this was not a place where prehistoric civilization once existed, so it could not be considered a relic of prehistoric civilization.
The so-called prehistoric civilization referred to the various prehistoric human civilizations that existed on Earth. However, the existence of prehistoric civilizations was not generally recognized by the scientific community and was still a controversial topic. However, some of them were thought to be relics or phenomena of prehistoric civilization, such as the footprints on the trilobites, the nuclear reactor in Africa, the Baghdad battery, etc. Some of these phenomena or relics were far beyond the time of human appearance, and some were far beyond the technological level of humans at that time. There were also relics or relics that surpassed the level of human technology at that time, such as the Mayan civilization, the Egyptian pyramids, and the Hanging Gardens of Babylon. Some scholars also believed that they were clues or evidence of the existence of prehistoric civilization.
Many civilizations had appeared on Earth, but many of their records had been forgotten by history. The following are some of the civilizations mentioned in history: Ancient Egyptian Civilization: Ancient Egyptian Civilization was one of the most prosperous civilizations on Earth in ancient times. It started around 3100 B.C. and lasted for about 500 years. The core of ancient Egyptian civilization was the pyramids and temples in the Nile River basin, as well as magnificent murals and sculptures. Ancient Greek Civilization: Ancient Greek Civilization originated in the 8th century B.C. and lasted for about 500 years. It was the cornerstone of European culture, including philosophy, literature, art, and science. The core of ancient Greek civilization was the politics and culture of the times of Athens and Pericles. Ancient Roman Civilization: The ancient Roman civilization began in 753 B.C. and lasted for about 300 years. It was one of the most glorious civilizations in European history, including the politics and culture of the Roman Republic and the Roman Empire. Ancient Indian Civilization: The ancient Indian civilization began around 2600 B.C. and lasted for about 5000 years. It is the ancient civilization of the South Asian subcontinent, including philosophy, religion, art and science. Ancient Chinese Civilization: Ancient Chinese Civilization began around 2100 B.C. and lasted for about 4000 years. It was one of the most brilliant civilizations in Asian history, including philosophy, literature, art and science. It should be noted that the history and records of these civilizations may be controversial and misunderstood, so the above information is only for reference.
There were many signs that Earth might have once had an advanced civilization. For example, six ancient nuclear reactors were found in the Oklo Uranium Mine in the Republic of Gabonese. These reactors had appeared 200,000 years ago, before humans were born. It was difficult for scientists to explain this phenomenon, which might imply that there was an advanced civilization that mastered nuclear technology before humans. In addition, the Mayan prophecy mentioned that modern humans were the fifth generation of civilization on Earth, which meant that there might have been advanced civilizations before us, but they were all heading towards extinction. There were also documents that showed that there was an advanced civilization on Earth 2600 years ago. There were detailed records of the Anunnaki's departure from Earth. The evidence included relevant records from the Near East and America, such as eyewitness reports from Haran City and records on stone pillars. Some of the records were written by the prophet Ezekiel, and Haran City was once the center of prosperity. From these aspects, there was a certain possibility that an advanced civilization once existed on Earth.
Currently, the existence of prehistoric civilizations was not widely recognized by the scientific community. It was still a controversial topic, so it was impossible to determine how many prehistoric civilizations there were on Earth.
There was no conclusion as to whether other civilizations existed on Earth before. From the current research, the existence of prehistoric civilization was not generally recognized by the scientific community and was still a controversial topic. There were some clues or evidence that were thought to be prehistoric civilizations. For example, the Uranium Ore found in the Republic of Gabonese in Africa was 2 billion years old. There was a nuclear reactor that had been operating for 500,000 years, and humans only built the first nuclear reactor in the 1940s. There was also the Mayan civilization, which had existed before 5000 B.C. It was said that it had already produced modern top-notch technology and had superb mathematical and astronomical attainments. However, it rose in the jungle overnight and disappeared during its most glorious and prosperous time. In addition, the pyramids of Egypt and the Hanging Gardens of Babylon were also regarded as relics or relics that surpassed the level of human technology at that time. At the same time, there were also some legendary ancient civilizations, such as the civilization of Mu, Lemuria, Atlantis, etc. These civilizations were said to have highly developed technology, but there was no conclusive evidence to prove their existence.
It was believed that there were many prehistoric civilizations on Earth. According to the archeological era, China's prehistoric culture was mainly divided into the Paleolith Age, the Neolith Age, the period of stone and stone, and the Bronze Age. In the legends, there were the following types of prehistoric civilizations: 1. The Gendaya Civilization was the civilization corresponding to the first solar era in the Mayan legends, also known as the superpower civilization. Legend had it that the Gendaya people were about one meter tall, and males had a third eye and special abilities. Its approximate location was between Africa and South America, and it was later destroyed by a great flood. 2. [Mizobudaya Civilization: Also known as the Food Civilization. It is said that the humans of this civilization are survivors of the Gendaya Civilization.] 3. [Muria Civilization: Also known as the bioenergy civilization and the giant civilization. The four ancient civilizations of modern times all support the existence of this civilization. There are also related descriptions in China's Classic of Mountains and Seas. The giant skeletons that have been repeatedly discovered on Earth are also considered evidence of the existence of this civilization.] 4. Atlantis Civilization: It first appeared in the book of the ancient Greek philosopher," The Conversation." This civilization's technology was unprecedentedly advanced. It had reached a very high level in the fields of art, astronomy, mathematics, physics, and so on. It could turn light into energy and also mastered the technology of rejuvenation. It sank to the bottom of the sea about 12,000 years ago, and its exact location is still a mystery. At the same time, there are many theories about its location. 5. Lemuria Civilization: Also known as Lemuria, roughly located between the southern part of the Indian Ocean and the Pacific Ocean. It was one of the four great civilizations that had disappeared along with Atlantis. Legend had it that the Lemoria people could already smelt high-purity metals and could communicate directly. This civilization was discovered in the 19th century. There were many explanations for its disappearance, such as the combination of floods, earthquakes, and asteroids hitting the Earth. Some scientists also speculated that it was caused by a nuclear war with the Atlanteans. 6. [Civilization of Mu Continent: Legend has it that the people of Mu Continent established the powerful Mu Empire, sent out trade fleets to carry out trade activities with the surrounding continents, established the Naka Empire in Myanmar, and invented flying machines.] British scholar James George Watt spent his life researching and believed that many islands in the Pacific Ocean had left behind the ruins of the civilization of the Mu Empire, including the giant statue of Easter Island. The Mu Continent sank 12,000 years ago. 7. ** Mohenjo-Daro Civilization of India **: This civilization and the Harapa Civilization are known as the representatives of the ancient Indian civilization. It is said that they have very high achievements in mathematics and have mastered the decimal system. In addition, there were also some that were thought to be the remains of prehistoric civilization, such as the nuclear reactor in Africa 2 billion years ago, but whether it was the remains of prehistoric civilization or alien technology was still inconclusive. The Mayan civilization, the Egyptian pyramids, the Hanging Gardens of Babylon, and other relics that surpassed the level of human technology at that time were also believed by some scholars to be related to prehistoric civilization. However, the existence of prehistoric civilization was not widely recognized by the scientific community and was still a controversial topic.
According to the " History of Earth Civilization " published by the British Anthropologist Van Persie in 2004, humans were now the fifth civilization on Earth. There were also views that the Gendaya Civilization, Mizobudaya Civilization, Lemuria Civilization, and other civilizations were before Earth. However, there were still many opinions and assumptions about the number of civilizations on Earth, and there was no conclusive conclusion at present. The novel " High Martial Era " is equally exciting. Everyone is welcome to click and read it!
I recommend " The Blazing Angel of Ghost Destruction." This was the first ghost destruction doujinshi light novel written by Handsome. The main character transmigrated into Charcoal Jiro's brother, who was turned into a ghost by Wu Pai. The Blood Ghost Spell had the power of the sun, wings, and the ability to eat ghosts. The gentle protagonist was very calm in the face of evil spirits. There were many characters with different constellations, ages, heights, and weights. The story had a gentle style, and he hoped that it would have a good ending. There was also I'm Not A Trainer, an urban familiar novel written by Kitagawa Nankai. The main character, Luo He, was a chef. He met his pet by cooking. It was a heartwarming daily story. The information about the male and female leads was complete, and there were also cute pets. Although it was similar to other works, it was also unique. " The Creator of the Second Dimension " was not bad either. It was created by the ashes of Wuhuo. The main character, Xu Rui, was making an animation in a parallel world, and there was a plagiarism plot. It contained many industry stories, and the style was casual and everyday. Finally, it was " Cataclysm of Earth ", a science fiction novel written by Shi Mian. It was about a young man leading the rise of Earth's civilization in the universe. There was also " Inferior ", a fantasy novel written by Ask Sky. It was about an ordinary person transmigrating to a special society. The novel " High Martial Era " is equally exciting. Everyone is welcome to click and read it!
There had been five human civilizations on Earth. According to archaeologists and historians, the origin of human civilization could be traced back to the ancient Egyptian civilization around 20000 B.C., followed by the ancient Greek civilization, the ancient Roman civilization, the medieval European civilization, and the modern American civilization.