Figure 14.2 Oceanic productivity can be observed from space. NASAS SeaWiFS satellite, launched in 1997, can detect the amount of chlorophyll in ocean surface water. Chlorophyll content provides an estimate of pro- ductivity. Red, yellow, and green areas indicate high primary productivity; blue areas indicate low. This image was derived from measurements made between September 1997 and August 1998. SeaWFSProject, NASA/Goddard Space FlightCenter/GecEye
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Why are some ocean areas productive and some areas oceanic deserts?
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