For About How Many Years Of Geological Time Have Humans Existed On Earth. Modern humans Homo sapiens evolved in Africa around 150000-200000 years ago. Civilization as we know it is only about 6000 years old and industrialization started in the earnest only in the 1800s.
For how many years of geologi c time did the non avian dinosaur exist on earth. Neanderthals had an equally large brain which existed about 300000 years ago. It is not absolute.
Why did homo sapiens survive.
Therefore their fossils represent less than 15 percent of Earths history. So humans have only existed for about 0004 of the age of the Earth. It spans over 45 billion years. There were 860 years and 8600 centimeters that passed before life appeared on Earth.
