How low can we go? That’s the challenge that has been taken up by scientists around the world over the last five decades, with each seeking to drill a hole that will go deeper than before. The goal: the Earth’s mantle. The mantle makes up 40 percent or more of the planet, which has a radius of 4,000 miles. The 1,800-mile-thick mantle sits—or more accurately, heaves up and down—just below the Earth’s crust and above the Earth’s core. The crust is just a tiny portion of the planet...
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