In the mid-twentieth century, oceanographers used what devices to map the ocean floor?
a. Seismographs
b. Convective current profilers
c. Isostatic sounders
d. Conductive detectors
e. Echo sounders
e
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When cities dumped sewage into natural waterways with limited capacity for dilution,
A) oxygen levels were severely lowered and most aquatic life died. B) the extra organic matter fertilized the region, which quickly filled in with new plants. C) the extra organic matter created fertile areas that attracted wildlife including migratory birds. D) bacterial growth greatly increased and the sewage was safely recycled into soil.
In the United States, ________ of the country is suited to wind power development
A) 10% B) 15% C) 25% D) 33% E) 66%
Bacterioplankton fall typically to which of the following size ranges?
A. 1-2 ?m B. 1-2 pm C. 1-2 mm D. 1-2 cm E. 1-2 nm
The wind shear associated with several major airline crashes is believed to have been caused by?
a. ?microbursts. b. ?dry lines. c. ?the jet stream. d. ?mesocyclones. e. ?the jet streak.