Brownouts and blackouts involve drops in voltage to complete losses of electrical power, often occurring when electrical demand exceeds supply
As demands for electricity push beyond the capacity of the existing power grid in the United States, when is it most likely that a brownout or blackout will disrupt electricity to your home computer?
A) During a weekday in the summer B) During a weekend in the winter
C) During a weekend in the summer D) During a weekday in the winter
A
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According to the theory of isostasy, mantle rocks over long periods of time behave as:
a. plastic material b. viscous material c. elastic material d. brittle material
Based on a stringent mitigation scenario for future fossil fuel consumption, temperatures in the Arctic are expected to rise by at least 2°C, and under a minimal mitigation scenario would rise by about 5°C by mid-century
a. True b. False
How does the Great Missoula flood help explain the directional flows of the Willamette and Columbia rivers today?
What will be an ideal response?
Salinization of soil is most widely caused by
a. people irrigating farms with ocean water. b. too much rain in tropical areas. c. farmers incorporating salt into their fertilizer. d. evaporation in arid climates pulling salt up from lower soil horizons.