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The surface of the earth is extremely hot and radioactivity kept the earth warm. Over time, the earth started to cool.
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At the time, the earth is being bombarded by meteorite impacts. It is still extremely hot.
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As the Earth continued to cool, the crust has been formed, and the earth is filled with rain clouds and covered mostly by an ocean.
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The earth's hot rocks cooled, forming mountains and volcanoes. The earth at the time was separated by islands and water.
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At around 3.8 billion years ago, the first single-celled prokaryotic bacterias began to form.
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The earth would become the size that we know at 2.8 billion years ago.
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The inner core of the earth formed around 1-1.5 billion years.
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Single-celled organisms eventually evolved into multicellular organisms around 570 million years. The first organisms lived in water.