Question

7. What are two pieces of evidence used to support the theory that dinosaurs became extinct as a

result of volcanic eruptions about 65 million years ago? (6 points)

Answer 1

The discovery of a layer of rock known as the K-T boundary, which separates the Cretaceous period from the Tertiary period. This layer contains high levels of iridium, a rare element that is more abundant in meteorites than in the Earth's crust. This suggests that a large meteorite impact may have occurred around the same time as the volcanic eruptions.

The presence of large-scale volcanic activity in the Deccan Traps region of India, which occurred around the same time as the extinction event. These eruptions are thought to have released massive amounts of volcanic gases into the atmosphere, which would have led to climate change and other environmental changes that could have contributed to the extinction of the dinosaurs.

Step-by-step explanation: