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The book chronicles the evolution of dinosaurs, their rise as the dominant clade, and ends with an account of their extinction from the Chicxulub asteroid. It also includes a discussion of the evolution of feathered dinosaurs and birds' descent from dinosaurs, and an epilogue of sorts discussing the post-dinosaur emergence of mammals.
A rebuttal in Astronomy & Geophysics countered that Loeb et al. had ignored that the amount of iridium deposited around the globe, 2.0 × 10 8 –2.8 × 10 8 kg (4.4 × 10 8 –6.2 × 10 8 lb), was too large for a comet of the size implied by the crater, and that they had overestimated likely comet impact rates.
The impactor is considered to have been a stony meteorite about 2 km (1.2 mi) in diameter. The site at the time was the shore of a shallow inland sea, [ 7 ] the Western Interior Seaway . The impact disrupted granite , gneiss , and shales of the Precambrian basement as well as sedimentary formations of Paleozoic age, Devonian through Cretaceous .
Comets is an anthology of science fiction short stories edited by Isaac Asimov, Martin H. Greenberg and Charles G. Waugh as the fourth volume in their Isaac Asimov's Wonderful Worlds of Science Fiction series.
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The Comet" is a science fiction short story written by W. E. B. Du Bois in 1920. It discusses the relationship between Jim Davis, a black man, and Julia, a wealthy white woman, after a comet strike unleashes toxic gases that kill everyone in New York except them.
But in “When The Sea Came Alive: An Oral History of D-Day,” Graff weaves together hundreds of eyewitness accounts to create a history that stands alongside those works, expanding readers ...
Apocalyptic fiction is a subgenre of science fiction that is concerned with the end of civilization due to a potentially existential catastrophe such as nuclear warfare, pandemic, extraterrestrial attack, impact event, cybernetic revolt, technological singularity, dysgenics, supernatural phenomena, divine judgment, climate change, resource depletion or some other general disaster.