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How Does an Observatory Work?
When magma rises through Earth's crust to a mid-ocean ridge, ocean observatory sensors detect the ground motion, the spilling lava, and the chemicals spewing from hydrothermal vents. Observations are relayed back to shore-based researchers, who can command their instruments and a robotic vehicle to make specialized measurements, and then muster an expedition to inspect the eruption firsthand.  (Animation by Jack Cook, WHOI)