Oceans

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Physical Environment > Oceans

Ocean (Eyewitness Books)
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Miranda MacQuitty
August 1995

Oceans CD-ROM

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World's deepest rocks recovered

The deepest rocks ever seen have been recovered by Australian and American researchers. They were found at the Earth's surface on the island of Malaita, east of Papua New Guinea. But they originate from deep within the planet, between 400km and 670km down. This is about twice as deep as anything studied before.

These depths are an important region of the planet's interior, where sudden changes in the densities of rocks occur.

The discovery should reveal new information about the chemistry and large-scale movement of material passing through this transition zone between what is known as the upper and lower mantle.

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