What is the K-T boundary?
A) a layer of dark sediment in the geological record formed at the same time humans learned to use fire
B) a boundary between rocks containing the oldest life and older rocks that contained no life
C) a boundary between the Earth's crust and the molten rock beneath it
D) a layer of dark sediment in the geological record separating the Cretaceous and Tertiary periods of Earth's history

Question

Quizplus · Accepted Answer

The K-T boundary is a layer of dark sediment in the geological record that separates the Cretaceous and Tertiary periods of Earth's history. It marks the end of the dinosaurs and many other species and the beginning of a new era of life on Earth.

What Is the K-T Boundary