Earth's core is mostly made of the metals iron and nickel, but it also contains lighter elements like hydrogen, oxygen and silicon. CharlesC via Wikimedia Commons under CC-BY-3.0 How Earth got its ...
Widespread ocean pollution threatens the health of more than 3 billion people, international study led by Boston College researchers shows Ocean pollution is widespread and getting worse, and when ...
THE wide appeal of Prof. Wegener's theory of the arrangement of ocean and continent is shown by, the issue of a third greatly revised edition and of this excellent English translation. His theory is ...
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