Billions of dollars are invested yearly for the purpose of space exploration, as navigating the galaxy is almost an obsessive preoccupation for the human race. Yet very little is known about the vast majority of our own planet: the internal mass of the Earth is immense yet, for the most part, the contents of inner Earth still remain a mystery with relatively little known of the secrets that lie beneath its surface and deep into its core.
via unknowncountry http://ift.tt/11SbyTl
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