What type of magma is produced when the asthenosphere starts to melt at divergent boundaries?
a) Mafic magma
b) Silicic magma
c) Intermediate magma
d) Granitic magma
e) Andesitic magma
Answer: a) Mafic magma
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Fill in the blank(s) with the appropriate word(s).
What is (are) the most pressing environmental problem(s) facing the Russian Domain today?
A) air pollution B) water pollution C) sea level rise D) air and water pollution E) desertification
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A) northeast B) northwest C) southeast D) southwest
Hard/Structural stabilization of a beach
A. is banned by the Coastal Management and Protection Act. B. is the best method for controlling beach erosion. C. is necessary to create littoral drift. D. often results in more, rather than less beach erosion.