The dinosaurs got killed off due to climatic changes occurred at the time as well as on spot impact of asteroid. Hence, both the statements, "An asteroid impact caused the Sun to be blocked" and "They were crushed by an asteroid" are correct.
The mass extinction of dinosaurs about 65 million years ago is explained as follows:
- When asteroid strike the Earth, the impact of striking was enormous that caused massive vibration of Earth crust, and the rocky particles including the tiny dust particles and sediments got off to the sky, out to the atmosphere.
- The bigger sized particles and rocky materials settled down with time, but the lighter particles kept on to float at atmosphere and blocked out the sun rays to reach the Earth.
- This caused the sudden climatic change which was quite unfavorable to the remaining dinosaurs on Earth.
- Many dinosaurs were died due to sudden impact of asteroid, but those who were alive, died to unfavorable climatic change.
Thus, we can conclude that the dinosaurs got killed off due to climatic changes occurred at the time. Hence, both the statements, "An asteroid impact caused the Sun to be blocked" and "They were crushed by an asteroid" are correct.
Learn more about the extinction of dinosaurs here:
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