Answer:
A. The mass extinction of dinosaurs occurred at the Cretaceous/Paleogene boundary.
Explanation:
The most known extinction is the associated with the Dinosaurs, which happened at the Cretaceous/Palogene boundary (66 million years ago), although there is still a huge discussion on the causes of such extinction (comet/asteroid, changes in sea level, volcano activity).
Such event meant the dissappearing of two-thirds of the living species on Earth.
The Arabian Desert, Gobi Desert
and the Karakum Desert
I think it’s all except the second one and the last
Answer:
I believe it is extrusive
