The origin of life on the Earth is a fortunate series of events. The Earth's distance from the sun was such that its atmosphere and surface cooled down to a moderate level. Liquid water-and not just water vapour-also formed, and it did not freeze as the sun was not too far away. The cooling of the Earth gave rise to a kind of 'primordial ocean'. The action of the UV rays of the sun, the lightning flashes produced by storms, and the countless volcanic eruptions gave rise to new complex chemical compounds. About 4 billion years ago, the first molecules appeared, from which the first unicellular organisms were formed.
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