When coal is burned to generate electricity, 70% of the primary energy in the coal is transformed into unused heat. This means that the energy conversion efficiency from chemical to electrical energy is ________
A) 70%
B) 30%
C) 0%
D) 100%
E) cannot be determined
B
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Which of the following types of data would be the best indication of the phase of the Pacific Decadal Oscillation (PDO)?
A) Sea-surface temperatures in the Pacific offshore of Alaska B) Air-pressure differences between Perth, Australia and Tibet C) Drought in Africa D) Temperature of the Gulf Stream
Describe the important aspects of the formation and breakup of Pangaea
What will be an ideal response?
What European countries were the primary colonizers of Latin America?
a. France and Britain b. France and Spain c. Spain and Britain d. Spain and Portugal e. France and the Netherlands
Which of the following statements regarding variations in Earth's orbit is true?
A. their combined effect on past global temperatures is purely hypothetical. B. even together, they don't produce enough temperature change to cause an ice age. C. they can fully account for the recent rise in global temperature. D. their effect on global temperatures was only recently discovered by NASA scientists. E. all of the answers listed here.