Which of the following best describes melting of the mantle at subduction zones that leads to island arc volcanos?
A) Heat is carried downward with the subducting plate and melts the mantle above the downgoing plate.
B) The subducting plate is heated as it is carried to depth and the subducted oceanic crust melts.
C) Water released from the subducting plate decreases the melting temperature in the mantle above the downgoing plate to generate magmas from the overlying mantle wedge.
D) The subducted plate subsides into the mantle and allows magma from the lower mantle magma ocean to rise toward the surface.
C
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Urban primacy occurs when
A) a country has a city three to four times larger than any other city in the country. B) the number of people residing in cities has exceeded that of those residing in rural areas. C) people in cities receive lower tax rates. D) a country implements a policy to reduce urban sprawl. E) a country's population is greater than 80 percent urban.
What explains this large annual temperature range?
What will be an ideal response?
Early scientists were in agreement about the age of Earth
a. True b. False
Which one of the following permitted the widespread move into suburbs after WWII?
A) Increased use of telephones and television B) Increased ownership of automobiles C) Improvements in the railway and bus systems D) Cheaper sources of energy