GEOLOGY

Detailed explanation-1: -Extinction is the death of all members of a species of plants, animals, or other organisms. One of the most dramatic examples of a modern extinction is the passenger pigeon.

Detailed explanation-2: -A mass extinction is usually defined as a loss of about three quarters of all species in existence across the entire Earth over a “short” geological period of time. Given the vast amount of time since life first evolved on the planet, “short” is defined as anything less than 2.8 million years.

Detailed explanation-3: -Extinction is the complete disappearance of a species from Earth. Species go extinct every year, but historically the average rate of extinction has been very slow with a few exceptions.

Detailed explanation-4: -Mass extinctions-when at least half of all species die out in a relatively short time-have occurred only a handful of times over the course of our planet’s history. The largest mass extinction event happened around 250 million years ago, when perhaps 95 percent of all species went extinct.

Detailed explanation-5: -End Ordovician (444 million years ago; mya) Late Devonian (360 mya) End Permian (250 mya) End Triassic (200 mya) – many people mistake this as the event that killed off the dinosaurs. End Cretaceous (65 mya) – the event that killed off the dinosaurs. 30-Nov-2022