Business / Agriculture / Hypoxie Zone: An area in the Gulf of Mexico off the mouth of the Mississippi River covering about 6,000 square miles where there is not enough oxygen to support fish and shellfish populations. The oxygen depletion is caused by an excessive amount of nutrients that are brought together from throughout the Mississippi River watershed. Many of these nutrients are believed to originate from agricultural activities, and the largest portion, over 30%, has been traced to the upper Mississippi drainage, according to research prepared by the U.S. Geological Survey.
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Zone Noun Synonyms: area, quarter, district, region, sector, section, sphere, belt, territory, province, realm, domain, precinct, bailiwick, department, terrain, circle, locality, locale, turf
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Health / Fitness / Target Heart Rate Zone: The number of heartbeats per minute reflecting the exercise intensity that gains the maximum training benefits from an aerobic workout. The formula for obtaining a target heart rate equals 220 minus y MORE
Science / Geology / Surf Zone: An area of breaking waves bounded by the point of first breakers, then landward to the maximum uprush of waves on the beach. MORE
Science / Marine Biology / Sunlight Zone: See Photic Zone. MORE