Earth’s
most recent major ecological catastrophe...
...occurred
65 million years ago.
The fossil record changes abruptly before and after this moment.
It indicates that the dinosaurs disappeared at this time.
In addition, the majority of other ocean and land animals went extinct.
What
happened? The evidence supports the
idea that the earth was
struck by an asteroid. Asteroids are constantly colliding with planetary bodies, as
evidenced by craters on
their surfaces.