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How were lands and oceans created?

Earth was originally formed by collisions of big and small aerolites. At the time, the earth surface was covered by molten magma with a temperature of 1,300° C. When the water contents of magma contacted with heat, they evaporated and became clouds. When reaching saturation, the vapors were then transformed into raindrops and fell to the ground. As the earth’s ground surface gradually cooled down, the raindrops accumulated on the ground surface then became the primitive oceans of earth, whereas the cooling of magma formed the rocks and shaped the primitive lands.

For more information, please go to the “Taiwan Geoscience Portal” website.