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The Big Bang caused quarks and electrons to be made. Quarks formed together to produce protons and neutrons, which then created the first elements, helium and hydrogen. Stars then used hydrogen and helium nuclei to form carbon and calcium.
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A star that was near a gas cloud exploded and sent a shockwave throughout the cloud. This caused most of the mass to form in the middle, creating the sun, and the sun had a protoplanetary disk around it. Within the first 100,000 years, the dust collides into each other and gradually forms clumps of matter. As 10 million years go by, the clumps of matter turn into planets.
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An asteroid the size of Mars hit Earth which caused parts of the asteroid and Earth to break off and started to orbit the Earth. The material then collided together to form the moon.
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Jupiter and Saturn moved towards the inner planets and cleared some of the debris, and then moved back out. Some of the debris may have hit Earth, which could have caused it to have water.
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The Earth forms its crust, trapping all the heat in its core. However, as the core is trying to escape, the land splits and forms tectonic plates. It also forms volcanoes.