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Discussion

The residence time of silver iodide in the environment matters because

  • A.residence time controls the total cost of the programme
  • B.it determines how far the agent spreads before deposition
  • C.silver iodide is chemically unstable in the open air
  • D.the agent must persist for several years in order for it to work

Answer: B

Deposition studies inform assessments of environmental effect on soils and water. Concentrations measured downwind of long running programmes have generally been very low. Monitoring continues at long established operational sites.

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