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From the cloud of dust made by Bigbang, our solar system has been molded. The earth has been positioned between venus and mars.
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Heavy materials sank into the core and lighter materials remained at the top.
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An object as big as Mars has been grazed the side of the earth.
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After Earth being collied with planet big as Mars, debris has been created. That debris orbited the Earth - collapsed and became the moon.
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After the moon has been formed, the earth became a more stable and balanced climate. Also, the earth started to have seasons.
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The magnetic field of the earth has been formed. The magnetic field was not complete at that time. It was on the stage of development.