In the United States today, the most widely used system to generate electricity uses
A) oil to power turbogenerators.
B) natural gas to power turbogenerators.
C) coal to power turbogenerators.
D) water to power hydroturbogenerators.
C
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Ordinary cell thunderstorms only last about one hour and begin to dissipate when ____
A) lightning neutralizes all the electrical charge in the cloud B) all the precipitation particles in the cloud turn to ice C) the downdraft spreads throughout the cloud and cuts off the updraft D) solar heating at the ground begins to decrease
This is not a major mechanism for the formation of clouds
A) orographic lifting. B) convection. C) frontal lifting. D) temperature inversion. E) surface convergence.
Both ________ and ________ can change global species diversity?
A) immigration; extirpation B) emigration; extinction C) extirpation; extinction D) speciation; extinction E) speciation; immigration
Which factor is NOT monitored in attempts to predict earthquakes by the dilatency model?
a. magnetic intensity b. radon gas emission c. seismic velocity d. number of foreshocks