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Earth was a huge ball of gases as days passed on many asteriods used to fall on earths surface creating deep valleys due to hot temparature lighter gases were floating in air  and heavier ones beneath the ground. due lighter gases rains came and filled the deep valleys with water and resulted in formation of oceans.thus earth has evolved to its present stage
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Thousands of years ago the earth was not like this which it is now it was a huge shere of harmful gases fire. asteroids and meteorites used to find there way to earth. but then there came animals plants which made humans who did many inventions.
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