Use the picture to answer the following questions:

1. in figure 11-1, what structure is labeled a?
a. graben
b. horst
c. syncline
d. basin

2. in figure 11-1, what is the structure labeled b?
a. graben
b. horst
c. anticline
d. dome

1. The correct answer is option b, that is, horst.  

In geology and physical geography, a horst refers to an elevated fault block bounded by usual faults. A horst refers to an elevated block of the crust of the Earth, which has remained stationary or has got lifted.  

2. The correct answer is option a, that is, graben.  

A graben refers to a valley with a different escarpment on each side resulting due to the displacement of a block of land downward. Graben generally takes place side by side with horsts.