Which of the following is a reason that we suspect that the extinction of the dinosaurs was caused by an explosive impact by a large object?
A) Many dinosaur fossils are found below the K-Pg boundary, but none above it.
B) The impact created the Moon.
C) The radioactivity of Earth's crust increases significantly above the K-Pg boundary.
D) There are several medium-sized meteor craters created by secondary impacts.
E) The remaining meteorite has been identified on the bottom of the Gulf of Mexico.

Question

Quizplus · Accepted Answer

The K-Pg boundary marks a distinct layer in the geological record, and the absence of dinosaur fossils above this boundary suggests a sudden extinction event. This aligns with the hypothesis of a large impact causing rapid environmental changes leading to the extinction of the dinosaurs.

Which of the Following Is a Reason That We Suspect