WHOI geoscientist Rob Evans adjusts a magnetic field-detecting instrument as a colleague, senior engineering assistant Matt Gould, steadies it. Evans studies magnetic fields as a way to learn about the structure of Earth's mantle and the processes occurring within it. Though this early (2001) version was towed by a ship, Evans' current instruments are deployed on the seafloor. (Photo by Tom Kleindinst, Woods Hole Oceanographic Institution)[back]
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