Giant regions of the mantle where seismic waves slow down may have formed from subducted ocean crust, a new study finds.
Scientists Wednesday announced the discovery of the 16-million-year-old remains of the largest river dolphin ever found on ...
Some studies have suggested that they're material from the ancient Earth — either a layer of primordial unmixed rock from the planet's formation or a leftover hunk of the giant space rock that ...
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