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

Environmental & Atmospheric Sciences

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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

Environmental & Atmospheric Sciences

At which point or points does the current flow fastest in the center of the channel?



A) A
B) B
C) C
D) D

Environmental & Atmospheric Sciences

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.

Environmental & Atmospheric Sciences

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

Environmental & Atmospheric Sciences