Downhill Flow of Water
Use the figure above to answer the following question(s).
What zone is indicated by the letter "C" and what characteristics does this zone have?
What will be an ideal response?
"C" is the floodplain zone, which contains rivers that empty into larger rivers or into the ocean. Streams join into wider and deeper rivers that flow across broad, flat valleys. Water in this zone usually has higher temperatures and less dissolved oxygen than water in the two higher zones. The slow-moving rivers sometimes support large populations of producers such as algae and cyanobacteria, as well as rooted aquatic plants along the shores. Because of increased erosion and runoff over a larger area, water in the floodplain zone often is muddy and contains high concentrations of silt. These murky waters support distinctive varieties of fishes, including carp and catfish.
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