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.
Part of the San Andreas fault. The definition of a fault is a weakness in the rock strata that can shift and create an earthquake. An example of fault is the San Andreas fault line in California. Fault means a mistake or a weakness. An example of fault is having a problem telling the truth. Fault is defined as to blame or to commit a mistake. 1  An example of fault is for a child to blame a broken vase on his brother.