Cloud seeding using silver iodide only works in?
a. ?cold clouds composed entirely of ice crystals.
b. ?warm clouds composed entirely of water droplets.
c. ?cold clouds with a low ratio of ice crystals to water droplets.
d. ?clouds with more ice crystals than supercooled droplets.
e. ?clouds that can produce precipitation.
ANSWER: c
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A) halite. B) borax. C) feldspar. D) gypsum.
The population of elk in Yellowstone
A) reflects top-down and bottom-up population regulation. B) has survived because of the elimination of keystone predator species. C) would have been more stable if there had only been one predator species. D) would be better off if all predators were eliminated from the park.
Where do the Himalayan Mountains lie, relative to the region of South Asia?
A) east of South Asia B) north of South Asia C) west of South Asia D) south of South Asia E) in the center of South Asia
Cave formations develop from the precipitation of
A) calcite. B) halite. C) phosphate. D) sulfate.