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Discussion

Physical rather than statistical evidence for seeding effects comes from

  • A.observing the seeded plume directly with radar and aircraft
  • B.comparing the seasonal rainfall totals between successive years
  • C.counting the number of seeding flights conducted
  • D.surveying the opinions of farmers in the area

Answer: A

Tracking the ice produced in a seeded plume demonstrates the chain of causation directly. Such studies have provided the strongest evidence available for orographic seeding. Each link in the chain was observed separately.

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