If you hold the end of an iron rod over a fire, your hand will become warm because of heat being transferred by:
a. convection.
b. advection.
c. conduction.
d. radiation.
C
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Hydroelectricity is an important renewable source for commercial power, producing about ________ percent of global commercial energy
A) 6 B) 10 C) 18 D) 27 E) 43
Sources of the oceans' salts are believed to include: a. the early atmosphere of the earth
b. all of these choices c. the earth's crust. d. volcanic eruptions.
In metamorphism, after a rock is heated,
A. it may or may not develop a new texture. B. it will develop a new texture. C. it will be deformed. D. it may or may not be deformed and it may or may not develop a new texture. E. it may or may not be deformed. F. it will be deformed and it may or may not develop a new texture.
What is the only region of the world that has become poorer since World War II?
A) East Asia (excluding Japan) B) Latin America C) Middle East and North Africa D) South Asia E) Sub-Saharan Africa