What are the differences between Block Mountains and Rift valley? Please answer fast!

Rift valley is a linear shaped lowland between mountain ranges or highlands formed due to the geologic rift or fault.
In formation of rift valley,due to high tensional force centre block drop down between the two blocks at its flank.The sunken portion is known as graben.

Block mountains are formed when due to crack or fault, one part of earth get uplifted and other get depressed.The uplifted part is called block mountain.The uplifted blocks at the flank of rift valley are  also called Block mountains.

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