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The Red Sea was exotic, but it wasnt unique, as it turned out. Scientists
spanned the globe in the 1960s, sampling seafloor sediments wherever they
could. They found metal-rich seafloor sediments near mid-ocean ridges in
the Atlantic, Pacific, and Indian Oceanswherever the seafloor was
spreading apart. The sediments contained high amounts of iron, manganese,
nickel, zinc, copper, cobalt, lead, and other metals.
Scientists in the Deep Sea Drilling Project also found similar metal-rich
seafloor sediments that had accumulated atop volcanic ocean crust at sites
far away from present-day active spreading centers. These ancient deposits
had formed at the crest of the mid-ocean ridges and had moved away to their
present positions as a result of seafloor spreading. Clearly, there was
a connection between metal-rich minerals and volcanic spreading centers.
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