The Permian-Triassic Extinction event, which occurred approximately 252 million years ago, is commonly referred to as the "Great Dying" due to its devastating impact on life on Earth.

The Cretaceous-Paleogene Extinction event, which occurred approximately 66 million years ago, resulted in the extinction of an estimated 75% of marine species.

The Cretaceous-Paleogene Extinction event, also known as the K-T Extinction, is associated with the disappearance of the dinosaurs and many other species.

The most widely accepted hypothesis for the cause of the Permian-Triassic Extinction event is massive volcanic eruptions that occurred in the Siberian Traps region.

The Ordovician-Silurian Extinction event, which occurred approximately 444 million years ago, is characterized by the disappearance of trilobites, a group of marine arthropods.

The Triassic-Jurassic Extinction event, which occurred approximately 201 million years ago, resulted in the extinction of an estimated 10 million species.

The Cretaceous-Paleogene Extinction event is associated with the disappearance of the ammonites, a group of marine mollusks.

The asteroid that is believed to have caused the Cretaceous-Paleogene Extinction event is called Chicxulub.

The Ordovician-Silurian Extinction event is associated with the disappearance of the graptolites, a group of marine invertebrates.

The Permian-Triassic Extinction event is estimated to have lasted approximately 1 million years.

The Permian-Triassic Extinction event is associated with the disappearance of the conodonts, a group of marine vertebrates.

The supercontinent that existed during the Permian period is called Pangaea.

The Permian-Triassic Extinction event is associated with the disappearance of the eurypterids, a group of marine arthropods.

The Ordovician-Silurian Extinction event, which occurred approximately 444 million years ago, resulted in the extinction of an estimated 10 million species.

The Cretaceous-Paleogene Extinction event is associated with the disappearance of the ichthyosaurs, a group of marine reptiles.