K–T extinction


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O—S The blue graph shows the apparent percentage not the absolute number of marine animal genera becoming extinct during any given time interval. It does not represent all marine species, just those that are readily fossilized. The labels of the traditional “Big Five” extinction events and the more recently recognised End-Capitanian extinction event are clickable hyperlinks; see Extinction event for more details.

In terms of severity, the event eliminated a vast number of species.

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American Horror Story frequently bases its creepy fiction on real-life events and people, from actual murders to performers in genuine freak shows. But in its seventh season, American Horror Story: Cult, the anthology series takes that approach to of-the-moment levels by setting its action around the presidential election and commenting directly on the national climate now that Donald Trump is in the Oval Office.

Its opening scene depicts people at an outdoor event — a rally for city-council candidate and undercover cult leader Kai Anderson Evan Peters — where gunshots are suddenly fired as attendees scream, dive for cover, and make mad dashes to escape. Ivy, the restaurateur played by Alison Pill, ducks behind a fountain and is shaking with fear when another character attempts to help tug her to safety and is hit, causing blood to splatter on the pavement and on Ivy.

Although I had not seen the edited iteration when I wrote this piece, I believe that making some trims was the right call. One of the reasons the AHS: They can very, very easily feel like gratuitous, unnecessary glorifications of the behavior they seek to condemn.

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He arrived early in a suit and shiny shoes, looking like a Chinese version of Manny from “Modern Family. Kept his eyes on his phone. Four hours into “Hangzhou Love,” as the crowd thinned and the sound crew started packing up, Cai had barely talked to a girl, let alone gotten a number. He stormed the stage to sing a love song. Or to bring him a boat, ideally with a wife in it.

What they don’t want is for Cai, or tens of millions of other young people, to stay single.

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Though swiping through Tinder is an effective way to end — or at least try to end — your dry spell , it’s not exactly the most safe app out there. Every Tinder user worries about meeting up with someone who looks totally normal in their profile but who’s actually batsh-t insane IRL. We understand your struggle, so we put together a list of apps that are similar to Tinder but have wayyy less of a creep factor. To keep things as broad as possible, we left out apps that are based solely on religion sup, JSwipe or on sexual orientation oh hey there, Grindr.

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The forest would have existed before the Great Dying Mass Extinction Event million years ago—an event that saw around 95 percent of life on Earth wiped out. Around 20 million years later, the first dinosaurs started to emerge. To better understand this extinction event, researchers from the University of Wisconsin-Milwaukee headed to a mountain range in Antarctica to look for samples of vegetation from when the continent was far warmer and was covered in lush vegetation.

Keep up with this story and more by subscribing now View of the Transantarctic Mountains.

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Alpha decay The process of radioactive decay in which the nucleus of an atom emits an alpha particle. The new atom’s atomic number is lower by two and its atomic mass number is reduced by four. Richardson Alpha particle A particle consisting of two protons and two neutrons, produced during alpha decay. Identical to the nucleus of a 4He atom.

Richardson Archean An eon of geologic time extending from about 3. Richardson Archean The second oldest eon in Earth history. It followed the Hadean , and lasted from around 3. During this time prokaryote life appeared and flourished, and the Earth was characterised by a reducing anaerobic atmosphere. The Archean was succeeded by the Proterozoic eon.

MAK Atom The smallest unit that has the chemical characteristics of a particular chemical element. It is about ten billionths of an inch in diameter and is made of a dense central nucleus of protons and neutrons , surrounded by a cloud of electrons. An atom may share electrons with an adjacent atom or atoms; the result being a molecule. MAK Atomic mass number The sum of the number of protons and neutrons in an atom.

Permian–Triassic extinction event

Governor Karyn Polito said. Santiago, Massachusetts Commissioner of Higher Education. These efforts will help reduce barriers and accelerate the timetable for students to complete their degrees. The College will develop a new Flexible Learning Model with hybrid learning classes in-person and online and “fast track” seven-week, back-to-back courses to allow Liberal Arts Transfer students to accelerate completion of their associate degrees.

The College will use the grant to support a new technology-based Proactive Advising program to aid its growing population of adult students as well as those who need remedial developmental courses before enrolling in college-level classes.

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Others hypotheses abound , but scientists do agree on one thing: To understand how this mass extinction unfolded and what might have caused it, scientists need a precise timeline. Comparing fossil evidence from the end of the Permian to the beginning of the Triassic period within the stratified rock tells scientists that many species were lost as time progressed: Within 20 or 25 centimeters of a sedimentary rock section, “you have a complete change in the look of the fossil record.

However, finer detail on what happened during the actual extinction is hard to find—the exact age of rocks that contain fossils from the extinction event is difficult to determine. But a fossil bed in Meishan, China allows scientists to get around this. Interspersed between large chunks of limestone fossil rock known to be from the end of the Permian, based on specific fossil formations as well as attempts to date nearby non-limestone rocks, are volcanic ashbeds.

These ash beds hold the key to finding out more precisely when animals died out. The authors’ methods went something like this:

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Carbon is a weakly radioactive isotope of Carbon; also known as radiocarbon, it is an isotopic chronometer. C dating is only applicable to organic and some inorganic materials not applicable to metals. Gas proportional counting, liquid scintillation counting, and accelerator mass spectrometry are the three principal radiocarbon dating methods.

Radiocarbon measurements are reported as Conventional Radiocarbon Age. What is Radiocarbon Dating?

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Mass Extinction of the Dinosaurs: Definition, Events & Causes

The Mass Super-Empowering Event serves to kick start the series The Event usually happens in act 1 or 2 of the pilot and provide a handy reason for the entire cast to get super powers. So why do authors use this trope? After all, one valid criticism of this trope is that it takes the “inventiveness” and diversity out of a Super Hero Origin story by repeating it across several characters. Well, it turns out that having fifty ways a Freak Lab Accident can give you super powers got old, fast, forcing quite a few Meta Origins to be applied to tidy up the place.

Another is that it frees the author from having to give exposition on the source of the powers to focus on the characters themselves and the way that they use their new powers, effectively giving more Character Development and characterization by showing how they react to getting great power — be it betrayal , smugness or responsibility.

Lastly, the cause for The Event can be a major plot hook for the hero es to unravel throughout the season.

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See Article History Alternative Titles: Cretaceous—Paleogene extinction, Cretaceous—Tertiary extinction, K—Pg extinction K—T extinction, abbreviation of Cretaceous—Tertiary extinction, also called K—Pg extinction or Cretaceous—Paleogene extinction, a global extinction event responsible for eliminating approximately 80 percent of all species of animals at or very close to the boundary between the Cretaceous and Paleogene periods , about 66 million years ago.

The K—T extinction was characterized by the elimination of many lines of animals that were important elements of the Mesozoic Era The K—T extinction ranks third in severity of the five major extinction episodes that punctuate the span of geologic time. The only lines of archosaurs —the group of reptiles that contains the dinosaurs , birds , and crocodilians —that survived the extinction were the lineages that led to modern birds and crocodilians. Of the planktonic marine flora and fauna, only about 13 percent of the coccolithophore and planktonic foraminiferal genera remained alive.

Among free-swimming mollusks , the ammonoids and belemnoids became extinct. Among other marine invertebrates, the larger foraminifers orbitoids died out, and the hermatypic corals were reduced to about one-fifth of their genera. Rudist bivalves also disappeared, as did bivalves with a reclining life habit, such as Exogyra and Gryphaea. The stratigraphically important inoceramids also died out.

Land plants appear to have fared better than land animals; however, there is evidence of widespread species extinctions of angiosperms and other dramatic shifts among North American plant communities. It is important to note that some groups of reptiles died out well before the K—T boundary, including flying reptiles pterosaurs and sea reptiles plesiosaurs , mosasaurs , and ichthyosaurs. Among surviving reptile groups, turtles , crocodilians, lizards , and snakes were either not affected or affected only slightly.

Effects on amphibians and mammals were also relatively mild.

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