How many mass extinctions have there been in the history of the earth?

The timing and consequences of the first 5 mass extinctions were:

The first mass extinction occurred at the end of the Ordovician period 100 million years ago, called the Ordovician mass extinction. This catastrophe resulted in the extinction of 85% of biological species;

The second mass extinction occurred in the late Devonian period 100 million years ago, and it is called the Devonian mass extinction. The catastrophe was mainly devastating to marine life;

The third mass extinction occurred at the end of the Permian period 100 million years ago, called the Permian mass extinction. This catastrophe resulted in the extinction of 95% of living species;

The fourth mass extinction occurred 200 million years ago in the late Triassic period, called the Triassic mass extinction. The catastrophe resulted in the extinction of 76% of all living species, mainly marine life;

The Fifth Mass Extinction.

It occurred at the end of the Cretaceous period 65 million years ago, called the Cretaceous mass extinction.

This extinction was marked by the mass extinction of the dinosaurs.

It has led to the extinction of about 80% of biological species.

Many people have always heard that there have been many civilizations on the earth, which is completely groundless nonsense.

Whether it is from archaeological excavations and genetic research, or from the study of the evolution of the earth, there is no evidence, not even the slightest clue that there is a civilization, so this article will not talk about these salted eggs.

The Earth's ecology has suffered five devastating blows so far, caused by celestial events and environmental climate change.

The Ordovician mass extinction occurred 100 million years ago, when there was nothing to do with us humans.

Life has been around since 3.4 billion years ago, but it has always been in a very low state, in the gestation stage. All the way up to the Cambrian period 500 million years ago.

There was a sudden explosion, but the life form was still relatively low-level.

Animals are mainly in the sea, there is nothing on land, not even plants.

Food chain. The tip of the species is a species called a straight-shelled nautilus.

The water animal, 6 meters long, weighs about 150 kilograms. This thing is the ancestor of mollusks such as octopuses and nautilus.

The straight-shelled nautilus preys on all creatures in the sea, such as trilobites.

Star turtles, horseshoe crabs, etc., but the horseshoe crabs can grow up to meters and can eat the straight-shelled nautilus, so they are the nemesis of the straight-shelled nautilus.

There was also an ice age.

10% of the ocean is frozen, and sea levels have dropped by 100 meters.

The catastrophe lasted 400,000 years and led to the extinction of 85% of species. Some large sea creatures were starved to death, some animals with small appetites and small bodies survived, some organisms evolved to adapt to the environment, vertebrates began to appear, such as star turtles evolved into echinosaurs, and earth organisms underwent a renewal.

The Paris Agreement signed by more than 180 countries

It is planned to limit the increase in global average temperature to 2 by the end of the century, but it seems that it has come to naught.

Some scientists believe that by 2050, a global catastrophe will come, some places will be flooded, some places will be desertified, and hundreds of millions of people will have to have to make a great migration.

By the end of the century, mass extinctions will be inevitable.

Will humanity be able to escape this?

It is reported that there have been 5 proven mass extinctions, namely the end of the Ordovician period 100 million years ago, the late Devonian period 100 million years ago, the end of the Permian period 100 million years ago, the late Triassic period 100 million years ago, and the Cretaceous mass extinction (dinosaur extinction period) 65 million years ago.

So far, five mass extinctions have been confirmed. The first was the Ordovician mass extinction, the second was the Nipan mass extinction, the third was the Permian mass extinction, the fourth was the Triassic mass extinction, and the fifth was the Cretaceous mass extinction.

There have been five widely recognized mass extinction events in Earth's history, and they are known as the "Great Five Extinctions" or "Five Mass Extinctions". These mass extinction events have led to massive species extinctions and dramatic reductions in biodiversity. The following is a brief introduction to the five major extinction premature ascension events:

Ordovician Silurian mass extinction (about 100 million years ago): This is the earliest mass extinction event to date, occurring from the late Ordovician to the early Silurian period. It is estimated that about 86% of marine species and 70% of terrestrial species are extinct, with the main reasons likely to be climate change and sea level decline.

End Permian mass extinction (about 100 million years ago): This was the worst mass extinction event, with an estimated extinction of about 96% of marine species and 70% of terrestrial species. Possible causes include volcanic eruptions, climate change, and methane releases.

End Triassic Mass Extinction (about 100 million years ago): This mass extinction event caused the extinction of about 70% of all species, including most marine and terrestrial organisms. Possible causes include volcanic eruptions, climate change, and sea level changes.

Extinction at the end of the Cretaceous period (about 66 million years ago): This is the most famous mass extinction event that led to the extinction of dinosaurs and many other biomes. The probable cause is that a meteorite with a diameter of about 10 kilometers hit the Earth, triggering widespread volcanic eruptions and climate change.

Cambrian Devonian mass extinction (about 44 million years ago): This mass extinction event had a low impact, with about 50% of marine species extinct The main reasons are likely to be climate change and a lack of oxygen in the oceans.

These mass extinction events have had a long-term impact on the planet's biodiversity and have had a significant impact on evolution and the evolution of ecosystems. Bu Lao.