The process of cloud seeding is based on the theory that:
A) warm clouds will produce more rain if droplets are encouraged to freeze inside the cloud.
B) silver iodide crystals act as freezing nuclei and enhance the Bergeron process.
C) silver iodide crystals make droplets heavier than usual so that they fall to the ground.
D) it is impossible to add too many freezing nuclei; the more you add, the more rain will fall.
B
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The diagram on the far left shows the moving particles of a gaseous material within a rigid container. Which of the three boxes on the right best represents this material upon the addition of heat?
A. Box A, because it shows the gas particles rising upon the addition of heat. B. Box B, because it shows the gas particles moving faster. C. Box C, because it shows how the particles expand upon the addition of heat. D. All three of these boxes show accurate representations of what happens to the particles within this rigid container upon the addition of heat.
The most common class of dunes is
A) parabolic B) star C) dome D) linear E) crescentic
All mutations are harmful. Indicate whether the statement is true or false
Which of the following is true of dolomite, calcite and silica?
A) Dolomite is not secreted by invertebrate animals for shells. B) It is not different in any way from calcite, but its molecules are arranged more tightly than silica's. C) It is not different in any way from silica, but its molecules are arranged more tightly than calcite's. D) They are all the same.