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During accretion, the heat melted rocks and metals. Then, gravitational attraction pulled the denser materials into the center and created the core of the earth.
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This was when elements released from the bigbang started to rotate faster and faster due to gravitational attraction. The rotation created a concentrated center, thus creating the sun. Other concentrations rotating around formed planets like the earth.
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Planetary cooling was when the hot surface of the earth, caused by continuous bombardment of asteroids and comets, began to cool off. As the planet cooled, volcanoes released gases and created the atmosphere, lava cooled down to created the solid crust, and oceans formed from asteroids that struck the earth.
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An asteroid the size of Mars crashed into earth and the impact created debris orbiting around the earth. These debris accumulated and formed the moon. In this stage, the moon was closer than the moon is today.
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Debris from the accretion started to collide and over time, they created the Earth.
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This was when the constant bombardment of asteroids and comets came to an end. In this stage, the Late Heavy Bombardment period had finished, so most of the planets int he solar system settled in the place the way it is today.
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Mars was formed around this date.