Answer :
Final answer:
The three primary zones of a river system, from highest to lowest are: the zone of sediment production, zone of transportation, and zone of deposition. Each zone involves unique ecological and geological characteristics representing different stages of a river's journey from source to mouth.
Explanation:
The three main zones of a river system, from highest to lowest are: b) Zone of sediment production, zone of transportation, and zone of deposition. They represent the three core stages of a river's journey from source to mouth.
The Zone of Sediment Production is where a river begins, often in high, steep areas like mountains, with good sources for eroding rock into sediment. This is followed by the Zone of Transportation, in which the river moves these sediments along its course. Sediments are received from tributaries and moved. The gradient is lower in this mid-section leading to slower flow where increased volume makes the width of the river wider. The final section of the river is the Zone of Deposition, where the river's current slows further, it widens and deposits more sediments. Photosynthetic organisms can be found here due to the slower flow and increased sunlight. Temperature also tends to increase here. This is also the zone with the highest biodiversity, including worms, insects, and vertebrates.
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