Published on 28 May 2014 | over 3 years ago
This first episode of Planet Earth is dedicated to the history of earth. How earth came in to existence and when? After formation how all the changes took place? Episode tells that earth formed around 4.54 billion years ago by accretion from the solar nebula. Volcanic outgassing likely created the primordial atmosphere, but it contained almost no oxygen and would have been toxic to humans and most modern life. Much of the Earth was molten because of extreme volcanism and frequent collisions with other bodies. Over time, our planet cooled down and formed a solid crust. Then it rained for millions of years after which Earth was finally hospitable to life. The earliest forms that arose enriched the atmosphere with oxygen. Life on Earth remained small and microscopic for at least one billion years. About 580 million years ago, complex multicellular life arose, and during the Cambrian period it experienced a rapid diversification into most major phyla. Around six million years ago, the primate lineage that would lead to chimpanzees (our closest living relatives) diverged from the lineage that would lead to modern humans.
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