At the end of the Cretaceous (K/T boundary)what unusual geologic phenomenon occurred that has been linked to mass extinction and the end of the dinosaurs?
A)A 10 kilometre diameter meteor impact occurred on the Yucatan peninsula.
B)Enormous outpourings of basaltic lavas built the Rocky Mountains in British Columbia.
C)The climate abruptly warmed and massive weathering of iridium poisoned the seas
D)Dinosaurs were hunted to extinction by Klingons.

Question

Quizplus · Accepted Answer

A 10 kilometre diameter meteor impact occurred on the Yucatan peninsula, causing massive global climate change and a series of extinction events including the end of the dinosaurs. This theory is supported by evidence of a large impact crater and high levels of iridium (an element commonly found in meteorites) in sedimentary layers dated to the time of the extinction.

At the End of the Cretaceous (K/T Boundary)what Unusual Geologic