After the Big Bang, matter and energy were sent flying out into space. What is now Earth was at first a ball of white hot gases and was millions of degrees. Eventually the Earth cooled, and the gases then became liquids. The denser liquids sunk to the bottom making the extremely hot core we have today while the less dense liquids settled on top and cooled even more. Once it had cooled, it became what we now call land. The land formed cracks and the water vapor from the inner layers of the planet then seeped through and formed clouds that rained and formed lakes, oceans, and rivers. There is much more detail in the link below.
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