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1. Ordovician: The Ordovician period is an interval of about 44 million years defined on the geologic timescale as spanning roughly from 488 to 444 million years ago (mya) and being noteworthy for both beginning and ending with extinction events, while also ... [100%] 2023-02-04
2. Ordovician: The Ordovician period is a theorized second period in the theorized Paleozoic era. It is posited that it started approximately 500 million years ago after the end of the theorized Cambrian era. [100%] 2023-02-28 [Geologic Systems]
3. Ordovician: The Ordovician (/ɔːr.dəˈvɪʃ.i.ən, -doʊ-, -ˈvɪʃ.ən/ or-də-VISH-ee-ən, -⁠doh-, -⁠VISH-ən) is a geologic period and system, the second of six periods of the Paleozoic Era. The Ordovician spans 41.6 million years from the end of the ... (Second period of the Paleozoic Era 485-444 million years ago) [100%] 2022-07-28 [Ordovician] [Geological periods]...
4. Ordovician: The Ordovician was the second period of the Paleozoic era and Phanerozoic eon. It lasted from 488 to 443 million years ago (give or take a million year margin of error). [100%] 2023-02-15 [Paleontology]
5. Ordovician: The Ordovician (/ɔːr.dəˈvɪʃ.i.ən, -doʊ-, -ˈvɪʃ.ən/ or-də-VISH-ee-ən, -⁠doh-, -⁠VISH-ən) is a geologic period and system, the second of six periods of the Paleozoic Era. The Ordovician spans 41.6 million years from the end of the ... (Earth) [100%] 2022-09-09 [Ordovician] [Geological periods]...
6. Late Ordovician mass extinction: The Late Ordovician mass extinction, sometimes known as the end-Ordovician mass extinction or Ordovician-Silurian Extinction , is the first of the "big five" major mass extinction events in Earth's history. It is often considered to be the second ... (Biology) [88%] 2022-06-28 [Late Ordovician extinctions]
7. Cambrian–Ordovician extinction event: The Cambrian–Ordovician extinction event occurred approximately 488 million years ago (m.y.a.). This early Phanerozoic Eon extinction event eliminated many brachiopods and conodonts, and severely reduced the number of trilobite species. (Earth) [88%] 2023-09-30 [Extinction events] [Early Ordovician extinctions]...
8. Ordovician–Silurian extinction events: The Ordovician–Silurian extinction events, also known as the Late Ordovician mass extinction, are collectively the second-largest of the five major extinction events in Earth's history in terms of percentage of genera that became extinct. Extinction was global ... (Earth) [88%] 2024-01-01 [Extinction events] [Late Ordovician extinctions]...
9. Late Ordovician mass extinction: The Late Ordovician mass extinction (LOME), sometimes known as the end-Ordovician mass extinction or the Ordovician-Silurian extinction, is the first of the "big five" major mass extinction events in Earth's history, occurring roughly 445 million years ago ... (Extinction event around 444 million years ago) [88%] 2024-07-15 [Extinction events] [History of climate variability and change]...
10. Extinction: Extinction refers to the complete elimination of a given species. Extinctions may have various causes, including over-hunting, loss of habitat, climate change, competition from other species, obliteration due to local or global catastrophes, plague, gradual evolution, many other factors ... [77%] 2023-12-17 [Biology] [Paleontology]...
11. Extinction: In astronomy, extinction is the absorption and scattering of electromagnetic radiation by dust and gas between an emitting astronomical object and the observer. Interstellar extinction was first documented as such in 1930 by Robert Julius Trumpler. (Astronomy) [77%] 2023-11-17 [Observational astronomy] [Galactic astronomy]...
12. Extinction: Extinction is the termination of a taxon by the death of its last member. A taxon may become functionally extinct before the death of its last member if it loses the capacity to reproduce and recover. (Termination of a taxon by the death of its last member) [77%] 2024-01-09 [Extinction] [Biota by conservation status]...
13. Extinction: In biology and ecology, extinction is the ceasing of existence of a species or a higher taxonomic unit (taxon), such as a phylum or class. The moment of extinction is generally considered to be the death of the last individual ... [77%] 2023-02-04
14. Extinction: All life on earth, from single-celled microbes and simple fungus to dinosaurs and mammals, is compelled to adapt to changes in their environment, which includes efficient competition with individuals of other species, following the process of natural selection. If ... [77%] 2023-09-22
15. Extinction: In biology and ecology, extinction is the ceasing of existence of a species or a higher taxonomic unit (taxon), such as a phylum or class. The moment of extinction is generally considered to be the death of the last individual ... [77%] 2023-02-03
16. Extinction (optical mineralogy): Extinction is a term used in optical mineralogy and petrology, which describes when cross-polarized light dims, as viewed through a thin section of a mineral in a petrographic microscope. Isotropic minerals, opaque (metallic) minerals, and amorphous materials (glass) do ... (Earth) [77%] 2023-09-14 [Optical mineralogy]
17. Extinction (optical mineralogy): Extinction is a term used in optical mineralogy and petrology, which describes when cross-polarized light dims, as viewed through a thin section of a mineral in a petrographic microscope. Isotropic minerals, opaque (metallic) minerals, and amorphous materials (glass) do ... (Optical mineralogy) [77%] 2024-01-09 [Mineralogy concepts] [Optical mineralogy]...
18. Extinction (psychology): Extinction is a behavioral phenomenon observed in both operantly conditioned and classically conditioned behavior, which manifests itself by fading of non-reinforced conditioned response over time. When operant behavior that has been previously reinforced no longer produces reinforcing consequences the ... (Philosophy) [77%] 2024-01-09 [Behavioral concepts]
19. Extinction (psychology): Extinction in psychology refers to the lowering of the probability of a response when a characteristic reinforcing stimulus is no longer presented. In Classical conditioning, this refers to the decline of a conditioned response when a conditioned stimulus repeatedly occurs ... (Psychology) [77%] 2024-01-09 [Behavioral concepts]
20. Extinction (2015 film): Extinction (formerly known as Welcome to Harmony) is a 2015 post-apocalyptic horror film directed by Miguel Ángel Vivas who also co-wrote the screenplay with Alberto Marini from the novel Y pese a todo by Juan de Dios Garduño ... (2015 film) [77%] 2023-12-18 [Spanish horror films] [French horror films]...