What makes a rift valley different from other types of valleys

A rift valley is different from river valleys and glacier valleys because it is not caused by erosion. Unlike valleys formed by rivers or glaciers, rift valleys can occur both on land and at the bottom of the ocean.

they were destroyed coming out of the civil war but after he war they were booming. if you need an in-depth answer follow up with me  

down below

answer conditional instability;