GEOLOGY

Detailed explanation-1: -(a) Block mountains are formed due to upward movement of middle block between two normal faults . The up-thrown block is also called as horst. The submittal area of such block mountain is of flat surface but the side slopes are very steep.

Detailed explanation-2: -Fault Block Mountains: Tension force pulls rock apart causing normal faults. Two normal faults cut through a block of rock, the hanging wall between each slips downward, the rock between moves upward, forming a fault-block mountain.

Detailed explanation-3: -Fault-block mountains are formed by the movement of large crustal blocks along faults formed when tensional forces pull apart the crust (Figure 3). Tension is often the result of uplifting part of the crust; it can also be produced by opposite-flowing convection cells in the mantle (see Figure 1).

Detailed explanation-4: -→ The fault-block mountains are mostly associated with normal faults.

Detailed explanation-5: -Compression forces form folded mountains, and tension forms fault-block mountains. Differences in forces, rather than in rock type or duration of the forces, cause formation of these two types of mountains.