The crust in the Basin and Range Province of Nevada, Utah, and Arizona is stretc

Question

The crust in the Basin and Range Province of Nevada, Utah, and Arizona is stretching; therefore, fault movement in this region must be a. Dip-slip Normal b. Dip-slip Reverse/thrust Strike-slip Left lateral Strike-slip right lateral c. d. 66. As oceanic crust is subducted, it melts, forming a body of magma. When this magma rises and interacts with the overlying continental crust, what change occurs in the composition of the magma? a. The composition of the magma causes it to . The composition of the produce only light-colored minerals. The silica content of the magma increases produce mostly dark-colored mafic minerals None of the above b. d.

Explanation / Answer

Answers:

65. Option a

Dip-slip normal

66. Option b

The silica content of the magma increases

Explanation:

Higher silica content of magma have high viscosity than lower silica content. Here the viscosity increases with increasing silica content

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