Deep inside Earth, scientists find weird blobs and mountains taller than Mount Everest

NBC News - 04-23

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“We live on a hunk of rock and metal that circles a humdrum star,” Carl Sagan declared in 1996, in one of the astronomer's last interviews. It’s a simplistic description of Earth, but for a long time many scientists would have gone along with it. There’s no way to explore our planet’s interior directly; the deepest hole ever drilled, the Kola Deep borehole in the Russian Arctic, reaches only 0.2 percent the way to the center. So even the best scientific maps didn’t look much better than your middle-school textbook cartoon showing an outer crust, an inner core and a thick layer called the mantle in between.