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Discussion

Consider the following statements about environmental concerns in seeding.
1. Silver concentrations downwind are generally found to be very low.
2. Deposition is monitored in long running operational programmes.
3. Silver iodide accumulates to toxic levels in a single season.

  • A.1 only
  • B.All of them
  • C.1 and 2 only
  • D.3 only

Answer: C

The first two are correct and reflect the monitoring evidence. The third is not supported by measurement, although long term accumulation remains a reasonable subject for continued study. Absence of evidence is not the same as evidence of absence.

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