THE MARTIN KARLSEN, A CANADIAN SHIP, IS A FLOATING LABORATORY FROM WHICH SCIENTISTS ARE ANALYZING PHYSICAL, CHEMICAL BIOLOGICAL AND METEOROLOGICAL CONDITIONS IN LAKE SUPERIOR. SUCH COMPLETE STUDY OF FRESH WATER IS CALLED LIMNOLOGY. LIMNOLOGIST ATTACHES NANSEN BOTTLE TO DROPLINE. THE BOTTLE WILL TAKE A WATER SAMPLE AT A SPECIFIED DEPTH

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