The K-T Boundary Refers to

Multiple Choice

The K-T boundary refers to

A) the boundary between ejecta and the crater floor.
B) the boundary at the abrupt onset on the Younger drays cold episode.
C) a mass extinction event caused by volcanic activity.
D) a mass extinction event caused by a change in plate movements.
E) an extinction that coincides with the end of the Cretaceous Period.