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Topic - Nasa’S Jet Propulsion Laboratory

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In this handout image provided by NASA’s Jet Propulsion Laboratory, a scanning lidar, which measure’s snow’s depth with lasers, left, and an imaging spectrometer that measures how fast the snow is melting into runoff are seen before a flight to measure the snowpack in California’s Sierra Nevada mountains on Sunday, March 23, 2014. (AP Photo/NASA Jet Propulsion Laboratory)