Author Question: Mafic magma at a temperature of 1200C intrudes into felsic continental-crust rocks 15 km below the ... (Read 53 times)

NguyenJ · **on:** Jul 16, 2018

Mafic magma at a temperature of 1200C intrudes into felsic continental-crust rocks 15 km below the surface. Will the granite melt? If so, what will happen to the resulting magma? Use information presented in the chapter to support your answer.

What will be an ideal response?

Question 2

There is an urgent need to improve the recycling strategy for e-wastes because

A) there is no profit to be made from the materials.
B) they contain toxic but valuable materials, and U.S. recyclers tend to outsource to China.
C) it has been easier and safer to dispose of e-wastes in landfills.
D) e-wastes contain large amounts of radioactive materials.

lolol · **Reply #1 on:** Jul 16, 2018

Answer to Question 1

Figure 4.18 is useful for answering these questions. At 15 km below the surface, granite completely melts into granitic magma at about 705oC, which is much less than the temperature of the intruding mafic magma. However, this rising magma may not make it to the surface because water will escape as gas as the pressure decreases and this causes an increase in the melting temperature.

Answer to Question 2

B