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1. One major event in Earth's past is the extinction of dinosaurs, which occurred about 65 million years ago.
2. In the fossil record, evidence supporting this event would include:
- Sudden disappearance of dinosaur fossils in rock layers dating to the end of the Cretaceous period.
- Presence of iridium-rich clay layer (known as the K-T boundary) globally, indicating a catastrophic event like an asteroid impact.
- Fossil records showing rapid diversification of mammals and other species following the extinction of dinosaurs.
- Discovery of impact crater evidence, such as the Chicxulub crater in Mexico, linked to the mass extinction event.
These pieces of evidence in the fossil record help scientists understand and support the theory of how the extinction of dinosaurs took place.
