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.
rift 1. n. 1. A fissure, crack, or opening, as in rock. 2.A break in friendly relations: a rift between siblings. 3. Geology An area where the lithosphere is thinning, typically associated with large faults and grabens. v. riftÂ·ed, riftÂ·ing, rifts. v. intr.ift 1. n. 1. A fissure, crack, or opening, as in rock. 2.