What are the main mass extinction events in the history of the earth?

The mass extinction events in the history of the earth, mainly the straight-shelled nautilus, the armor fish, the shield fish, the lidont, the water dragon, the Kent's beast and most other creatures have become extinct.

The oxidation crisis 2.5 billion years ago wiped out most anaerobic organisms. During the Cambrian period 100 million years ago, most marine life disappeared. The Jurassic mass extinction 200 million years ago, the disappearance of large animals.

The Permian mass extinction event 100 million years ago was the worst extinction event in the history of the earth, causing the extinction of 96% of marine life and 70% of terrestrial life.

The first mass extinction, also known as the Ordovician mass extinction.

The mass extinction at the end of the Ordovician.

Severely damaged the marine ecosystem, resulting in 85% of marine life at the time.

Species extinction. The scientific community generally believes that the mass extinction is related to glaciation, but its duration, process and specific mechanism have been inconclusive.

On the basis of detailed sedimentological studies, the researchers combined for the first time the differences in sedimentation rates of different lithologies, and finally found that the mass extinction at the end of the Ordovician period occurred between 100 million and 200,000 years ago. It is glaciation that triggers the extinction of organisms.

Extinction causes

Meteorite impact said.

Some scientists believe that meteorites or asteroids hit the Earth to cause the Permian.

The end-of-life mass extinction. If this impact reaches a certain level, it will create a devastating shock wave around the world.

Causes climate change and the death of living things. Some of the evidence gathered has drawn attention to this view. But most biological scientists believe that this extinction was caused by natural changes on Earth.

Climate Change said.

Some scientists believe that climate change is the cause of this catastrophe.

The main reason. Because the rocks formed at the end of the Permian show that the climate cooled in some areas at that time, and ice sheets formed at the poles of the earth. These huge white ice sheets, which emit sunlight back into space, can further lower global temperatures, making it difficult for life on land and at sea to adapt.

If you add to this falling sea levels and volcanic eruptions.

It will be a catastrophe.

Earth has had five mass extinction events to date.

1. Ordovician-Silurian extinction event: ended 100 million years ago and killed about 86% of species;

2. Late Devonian extinction event: it ended 100 million years ago and killed about 75% of species;

3. Permian-Triassic extinction event: It ended 100 million years ago and killed about 96% of species;

4. Triassic-Jurassic extinction event: ended 200 million years ago and killed about 80% of species;

5. Cretaceous-Tertiary extinction event: ended 65 million years ago and killed about 76% of species.

How to avoid mass extinctions?

Humans may be able to devise various geoengineering solutions to deal with mass extinction events, such as controlling the Earth's climate through advanced technologies. This sounds amazing, but it also raises some concerns. First, large-scale climate experiments will almost certainly have unintended consequences.

Perhaps while expecting scientists to save humanity (and other species), there are some actions we can take ourselves.

If we want to stop mass extinctions, the first thing we need to do is tackle human-induced climate change. Some scientists believe that the planet may have passed a tipping point from which there is no turning back, but a 2014 report by the United Nations Hail Programme and the World Resources Institute suggests that there is a glimmer of hope.

To keep global warming below 2 degrees Celsius – the criterion for avoiding dangerous climate change, we need to reduce greenhouse gas emissions by 50% by 2050 – a somewhat daunting figure.