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. THE SUBMERSIBLE PUMP BEING LOWERED INTO THE LAKE WILL PROVIDE THE SURFACE WATER REQUIRED FOR SOME OF THE LIMNOLOGICAL STUDIES

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