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Dust, gas, and rocks started accumulating together to form the Earth
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One huge asteroid the size of Mars hits Earth and breaks off a huge piece of it. This rock got stuck in orbit around the Earth and many more smaller rocks started becoming part of it. This all came together to form the moon.
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Multiple asteroids were constantly hitting Earth, and al of the other planets in the solar system
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After the huge asteroid hit Earth, Earth started cooling down. By 4 billion years ago, Earth was at a temperature suitable for life. The crust of Earth had cooled down, and the molten rock inside was also starting to cool down and concentrate.
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All of the constant asteroids hitting the planets of the solar system stopped at around 3.8 billion years ago.