Some of the first experiments in cloud seeding were conducted by Vincent Schaefer and Irving Langmuir during the late 1940s. To seed a cloud, they dropped crushed pellets of ____ from a plane.
a. silver iodide
b. silver iodine
c. lead iodide
d. cupric sulfide
e. dry ice
Question 2
The idea in cloud seeding is to first find clouds that have too low a ratio of ice crystals to droplets and then to add enough artificial ice nuclei so that the ratio of crystals to droplets is about ____.
a. 1:100
b. 1:1,000
c. 1:10,000
d. 1:100,000
e. 1:1,000,000
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