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5 billion years were needed to create the Earth and it hasn't taken us nearly as much time to pollute it and destroy it.

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It is said that the first Homo Sapiens lived in Africa about 200 000 years ago.

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Apes started to evolve: they began to walk on two legs, their hands became available to hold objects and their brain size increased, among other things. 2 million years ago, the first mammals were classified into the species 'Homo'. As humans developed, they started to create tools and use fire to cook.

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Mammals became the largest land animals alive and the ambulocetus took the oceans to later evolve into whales.

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Certain dinosaurs evolved into mammals 200 million years ago and into birds 150 million years ago. Unfortunately, 65 million years ago an asteroid made 75% of the species, including non-avian dinosaurs, become extinct.

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This was the period when dinosaurs appeared. At that moment, there was only one supercontinent called Pangea, but it was later torn apart by plate tectonics. Dinosaurs existed for 160 million years, until an asteroid hit the Earth, causing the extinction of some species.

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The Permian extinction occured 250 million years ago and 95% of the species of that time disappeared. In addition, the climate became hotter and drier.

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Amphibians were the first vertebrates to move to land.

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Thanks to oxygen, the ozone layer thickened and so, life diversified around 541 million years ago. Firstly, hard-shelled invertebrates appeared, and then came the 'Age of Fish'. After that, fungi developed and they were the first organisms to live out of the water. Some fish also started to spend time near the shore and ended up developing lungs.

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Methane was abundant in the atmosphere and it was able to trap heat. Nevertheless, this greenhouse effect started to fail and the planet froze. It remained like that for about 300 million years.

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Photosynthetic organisms appeared from 3.2 to 2.4 billion years ago and enriched the atmosphere with oxygen. Cyanobacteria filled the oceans and it was one of the main producers of this element. However, oxygen was toxic for them and they eventually disappeared. But the levels of oxygen were already so high that the Oxygen Catastrophe happened. Only the forms of life that acquired the ability to benefit from oxygen managed to survive.

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This is the Last Universal Common Ancestor, which is as far as we can trace the existence of life. It was discovered by looking at the genes shared across all three domains of life today.

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Simple organic compounds started to grow and reproduce billions of years ago and they gave rise to the species we know nowadays. The first form of life is thought to have been an autotroph that lived in a hot, oxygen-free place and obtained energy from a chemical gradient. Therefore, the perfect place for this organism must have been a hydrothermal vent, that is to say, a fissure in the crust where seawater enters magma chambers and is ejected back at high temperatures together with minerals and simple chemical compounds. Especifically, scientists believe this place was a white smoker at Lost City (Mid-Atlantic Ridge).

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The first oceans appeared on Earth and the moon was formed due to the collision of protoplanets into the Earth. Moreover, it is believed that these collisions caused the creation of DNA. The climate was now more stable and the temperatures lowered. There was one supercontinent called Vaalbara, too.

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The Earth was still in its bombardment stage; there was no life and the temperatures were really high. There was also a lot of volcanic activity happening in the planet.

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The Earth was already orbiting around the Sun 4.5 billion years ago, but no organism could survive the radiation that came from this star. The temperature on Earth was extremely high, there was no oxygen and meteorites and asteroids frequently hit the planet. Because of these conditions, the Earth was transformed: the core, the mantle, the crust, the atmosphere and the magnetic field were created.

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Gravity was what formed the Earth from a cloud of dust.

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The Sun contained Hydrogen and Helium, whereas the planets were made up of heavier elements.

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Since the Big Bang took place, the universe has been changing and expanding. The birth and the death of starts have caused galaxies, planets and living organisms to form.