What did scientists find at the KT Boundary Line (the line at which dinosaurs went extinct)?
A.
Iron
B.
Copper
C.
Iridium
D.
Carbon
C.
Scientists found high levels of the element iridium at the KT Boundary Line, which is the layer of sediment that marks the transition between the Cretaceous and Paleogene periods. This discovery led to the hypothesis that an asteroid impact was the cause of the mass extinction event that led to the extinction of the dinosaurs.