86 The History of the Earth【Past and Future】Dialogue with the Universe

86 The History of the Earth【Past and Future】Dialogue with the Universe
13.7 billion years ago Big Bang
4.6 billion years ago   Earth's formation (primitive atmosphere is mostly hydrogen and helium).
4.3-4.0 billion years ago  Ocean was born
3.8 billion years ago Birth of unicellular organisms
600 million years ago Birth and explosion of multicellular organisms(the Cambrian)
400 million years ago Plants advanced the land from the sea.
360 million years ago Animal’s landing
300 million years ago   Increase of insects (cockroaches = living fossil)
Emergence of reptiles
250 million years ago Mass extinction of lives (Permian)
Emergence of dinosaurs
225 million years ago   Emergence of mammals
220 million years ago   Mass extinction of lives
150 million years ago   Emergence of archaeopteryx
140 million years ago   Division of Australian continent
100 million years ago  Golden age of dinosaurs (The average temperature was about 23℃. Temperature of current average is 15℃.)
65 million years ago A mass extinction of organisms= Extinction of dinosaurs(Collision of comet(about 10km diameter))
Emergence of primates(Ability to synthesize vitamin C is lost)
25 million years ago The oldest fossil that seems to be apes
10 million 〜5 million years ago The formation of the Great Rift Valley in Africa began.
about 6 million 〜 5 million years ago The differentiation of Humans and chimpanzees
about 2.5 million 〜 1.8 million years ago  Start of Stone tools
1.7 million years ago  Human beings born
About 0.5 million years ago  Peking man
About 230,000 years ago    Emergence of Neanderthals
About 200,000 〜190,000 years ago  Emergence of Homo sapiens (present people)
160,000 ± 40,000 years ago   Mitochondrial Eve in Africa
(150 000 years ago   polar bear and brown bear was divided)
About 100,000 years ago Modern humans (Homo sapiens) were spread out of the Africa.
About 30,000 years ago   Extinction of Neanderthal
About 30,000 〜 20,000 years ago Mongoloid passed to the Americas.
About 14,000 〜10,000 years ago Humanity tamed the dog.
About 13 000 years ago  Japanese archipelago became the island.
10,000 years ago      The end of the last ice age
20th century  The development of science and technology, the explosive growth of population, globalization, world war, environmental destruction and resource depletion concerns
The 21st century   Development and commercialization of new energy. Development of IT, biotechnology and nanotechnology. Multi-polar world.