Background extinction rate, also known as ‘normal extinction rate’, refers to the standard rate of extinction in earth’s geological and biological history before humans became a primary contributor to extinctions.
Earth | history | American Museum of Natural History | Natural History Museum | United States Geological Survey | Earth-616 | History | Google Earth | History (U.S. TV channel) | Earth Day | natural history | Field Museum of Natural History | History of China | National Museum of Natural History | Friends of the Earth | From the Earth to the Moon | Cursed Earth | Earth, Wind & Fire | The History Channel | Middle-earth | Natural history | Jewish history | Swedish Museum of Natural History | Natural History | National Museum of American History | Carnegie Museum of Natural History | British Geological Survey | art history | AP United States History | From the Earth to the Moon (miniseries) |