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Three of the following provide physical evidence of a seeding effect. Which is the odd one out?

  • A.aircraft measurement of crystals downwind of the flare
  • B.tracer chemistry confirming agent in the target
  • C.a higher seasonal rainfall total than last year
  • D.radar detection of ice in the seeded plume

Answer: C

A seasonal total confounds seeding with every other influence on the weather. The other three each observe a specific link in the causal chain. A seasonal total confounds every influence at once. Only a plume observation isolates the seeding itself.

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