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Discussion

Match each seeding agent with what it does.
List I
A. Silver iodide
B. Solid carbon dioxide
C. Liquid propane
D. Sodium chloride
List II
1. produces intense local cooling on expansion
2. nucleates ice by lattice resemblance
3. acts as a large hygroscopic condensation nucleus
4. chills air enough for homogeneous freezing

  • A.A-2, B-4, C-1, D-3
  • B.A-4, B-2, C-1, D-3
  • C.A-2, B-4, C-3, D-1
  • D.A-3, B-1, C-4, D-2

Answer: A

The first three are glaciogenic and the fourth hygroscopic, so they suit quite different clouds. The delivery method and the cloud type together decide which is appropriate. No single agent suits every cloud that might be seeded.

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