What generally happens when subduction-derived magma encounters thick continental crust?
A. the magma solidifies in sheeted dikes with a composition of basalt
B. the magma interacts with the crust, forming felsic or intermediate compositions
C. the oceanic crust melts
D. most magma reaches the surface with minor modification
Answer: B
You might also like to view...
A ________ plate boundary is associated with lateral slippage, conservation of existing crust, and is descriptive of the San Andreas fault system
A) convergent B) fault scarp C) divergent D) subducting E) transform
Which of the following would not be considered part of the direct input of energy from the sun?
What will be an ideal response?
Which of these cities is likely to see its coldest temperatures in July?
A) London, England B) New York, New York C) Buenos Aires, Argentina D) Moscow, Russia
The best evidence that the Sun is a newcomer in the universe is
A) the existence of heavy elements in its composition. B) its relatively slow rate of spin. C) its high temperature as revealed by its color. D) its position in the galaxy. E) its very existence in spite of its high burning rate.