The History of Earth



In the beginning, about 4.6 billion years ago, our solar system did not exist. But then, the Sun formed from a collection of clouds of gas and dust in space. It later formed into a disc due to rapid rotation and gravity. At the center of rotation, the gas became dense and formed a baby star, our Sun!

The leftover debris far away from the center formed the planets. One of them was Earth. It was just a big chunk of rock. More and more asteroids crashed into Earth, causing it to get bigger. It later turned into a sphere, and we went into the Precambrian Era, which was about 4.5 billion years ago. The carbon dioxide from the lava formed the atmosphere, and the water vapor in the atmosphere turned into clouds that brought rain that caused the seas to form.

After the seas formed, the first microbe appeared. The microbes split to make more copies of them and evolved to get more complex and eventually turned into plants and animals. Cyanobacteria and algae helped our Earth to fill our atmosphere with oxygen, which led to the creation of our protective ozone layer.

Next is the Paleozoic Era, which was about 600 million years ago. In this period, shelled marine life evolved into mammal-like reptiles. More complex plants and animals started to form. The forests of this Era would later produced coal deposits that were exploited by the industrial revolution.

The Mesozoic Era was the era of dinosaurs. Other new life forms of this Era include turtles, crocodiles, ancestral birds, primitive mammals, flowering plants, snakes, lizards and social bees. It was about 200 million years ago. However, the Mesozoic era came to an end when a huge meteor from space crashed into the Earth’s surface, probably around the Gulf of Mexico.

The last, the Cenozoic Era, which continues until today, began 65 million years ago. This is the era where mammals evolved in more complex ways to produce whales, primates and humans. Man started to appear about 120,000 years ago. But not until the last 10 thousand years that human culture started to rise. The domestication of animals, the cultivation of plants and the scientific theory have helped us to rise as the major dominating species.

And Earth turned into the planet we live in today.

Thank you for reading! I hope you will read my other blogs! Thanks!

Nat

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