A cohort is a group of people who share a common characteristic or experience within a defined period (e.g., are currently living, are exposed to a drug or vaccine or pollutant, or undergo a certain medical procedure).
A rift valley is a lowland region formed by the interaction of Earth's tectonic plates. This small rift valley has a typical formationâlong, narrow, and deep. It was formed by the Thingvellir rift, where the North American and Eurasian tectonic plates are tearing, or rifting, apart over a hotspot on the island of Iceland.
What is a Rift Valley Landform? A rift valley is a valley or depression in the land bordered by fault zones and separating tectonic plates. The depressed areas of a rift valley are formed by one or more grabens. A graben is a fallen portion of land with faults on 2 or more sides. When outer landmasses move away from the fault zones, the land in the middle can slowly drop during a period of thousands of years.