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Solid materials collide with each other and pulled together other particles under the influence of gravity to form Earth
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The giant-impact hypnosis says the moon formed from the ejecta of a collion between earth and a planetesimal about the size of Mars.
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Earth is stable enough to have rocky terrain, clouds, and enough rainwater to form oceans.
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From 4.5 to 3.8 billion years ago, failed planets and smaller asteroids slammed into the earth.
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The earth's core formed with heavy elements colliding and binding together with dense material being pulled to the center. The solid inner core is surrounded by a molten iron outer core.
