A blackout like the eight-state blackout of 2003 could be prevented by
A) using energy efficient lights in most businesses.
B) a self-healing smart electrical grid.
C) switching from coal to natural gas for electrical generation.
D) greater use of electricity during the work week instead of weekends.
B
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At which point or points does the current flow fastest in the center of the channel?
A) A
B) B
C) C
D) D
Limbs probably initially evolved to ____
A)walk on land B)swim in the ocean C)limbs have no function D)swim in shallow streams E)run
An important principle in one of the theories of the electrification of clouds is that
a. ?there is a net transfer of negative ions from a warmer object to a colder object. b. ?supercooled water is always negatively charged. c. ?ice crystals are always negatively charged. d. ?there is a net transfer of positive ions from a warmer object to a colder object. e. ?raindrops are always positively charged.
In what region of Africa is the Great Rift Valley located?
A) Central Africa B) Southern Africa C) Northern Africa D) Western Africa E) Eastern Africa