Major disasters have occurred on the earth such as meteor showers until ancient Merapi volcano erupted making living species declined dramatically. The disaster left nearly 95 percent of the species on the earth extinct at that time. Here are the top 5 mass extinction that has occurred on earth.
1. Ordovician Period 445 Million Years Ago
Mass extinction is caused by global cooling and a decrease in sea level on the earth. Formed a giant ice sheet that stretches to the south of the earth due to climate change. The surface of the sea water recedes after the ice sheet begins to melt, followed by a drastic drop in the oxygen content in the ocean.
In the Ordovician period, most living things still inhabit water, such as trilobites, brachiopods, and graptolite. Doomsday first period kills and destroys 85 percent of living things in the ocean.
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2. Devonian Period 340 Million Years Ago
The second extinction occurred around 340 million years ago during the Devonian period. The trigger for the second apocalypse in earth’s history is the change in sea level, asteroid strikes, climate change, and the emergence of new plants.
About 70 percent of living things in the ocean die because they cannot defend themselves against changes in ecosystems, especially coral reefs that can only reproduce 100 million years later.
3. Permian Period 251 Million Years Ago
The third apocalypse occurred at the end of the Permian era, around 251 million years ago. The cause is triggered by eruptions around Siberia, which emit carbon dioxide, and lead to the formation of greenhouse gases, rising methane and earth temperatures, and toxic air. Events that occurred at this time were known as one of the most severe extinctions that occurred on the earth.
It is estimated that 96 percent of marine species become extinct in the not too distant future. Then 70 percent of vertebrate animal species are also extinct. This event made life on earth back again as far as 300 million years.
4. Triassic Period 200 Million Years Ago
The increase in the content of methane and carbon dioxide also began the fourth apocalypse in the Triassic period 200 million years ago. When this event occurred at least half of the species on the earth became extinct. Everything dies due to major changes in the atmosphere.
The apocalypse of this period caused most extinct animals, including marine reptiles, a number of giant amphibians, and a large number of cephalopod molluscs. However, plants are not much affected in this mass extinction.
5. Cretaceous Period 65 Million Years Ago
The fifth apocalypse occurred 65 million years ago in the Cretaceous period. Declining sea levels, volcanic eruptions, and peaks of giant asteroids on the Yucatan peninsula in Mexico that caused dinosaurs to become extinct.
Most extinctions on this apocalypse occur in invertebrate animals in the ocean such as species of crustaceans, ammonite, and squid. Fish species also experienced a sharp decline, even 90 percent of fish species became extinct. Only insects and some groups of animals can survive. The great events that took place in this era marked the end of the Mesozoic era and the beginning of the Cenozoic era.