The K-T extinction event was characterized by - among other things - a high sulfur content in the atmosphere. This originated from A. emissions of the Deccan Traps B. volatilization of the S-bearing asteroid C. volatilization of the S-bearing impacted rocks

Paleontologists disagree over whether the Chixculub asteroid event or the Deccan Traps volcanic activity was the primary source of the environmental changes that led to the extinction of the dinosaurs 66 million years ago. Recently, a team of researchers has concluded that only volcanic activity could cause those changes. To prove this, study leads Alexander Cox and Benhin Keller developed a computer model that simulated over 300,000 possible scenarios using data from the fossil record to determine which gases were present in the environment 66 million years ago. Their model showed that large amounts of carbon dioxide and sulfur were present in the atmosphere at the time of extinction. Which finding, if true, would most directly support Cox and Keller’s conclusion?Both the Chixculub asteroid event and the Deccan Traps volcanic activity have been known to have had a significant impact on gasses present in the atmosphere.eliminateThe existing data from the fossil record is limited and may not capture the full scale of the environmental changes that could lead to an extinction event.eliminateThe amount of carbon dioxide and sulfur in the atmosphere 66 million years ago is consistent with the emissions released by the Deccan Traps.eliminateThe computer model showed a sharp decrease in the amount of organic carbon (or plant and animal matter) at the time of the Chixculub asteroid impact.

The  physical phenomena that mark rocks of about 65.5 million years ago can be as easliy explained scientifically by the gigantic Deccan Traps eruptions as by the asteroid impact of Chicxulub.A. TrueB. False

Why is a change in the forams at the KT boundary significant? Group of answer choicesThey are sensitive to temperature changes, suggesting that the planet must have cooled significantlyThe depended heavily on the dinosaurs, suggesting the dinosaurs must have gone extinctThey are highly sensitive to radiation, suggesting a large meteorite must have hit the EarthThey were the base of the food chain, suggesting a massive worldwide extinction

(Q019) Which of the following was important in determining the cause of the K-Pg (Cretaceous-Paleogene) extinction?Group of answer choicesglass spheres in K-Pg boundary rocksiridium in K-Pg boundary clayshocked quarts in K-Pg boundary clayall of the possible answers are correct

During large volcanic eruptions, tremendous amounts of ash and gases are spewedinto the atmosphere, where they reflect incoming solar radiation and reduce atmospherictemperatures.【】We know that small droplets of sulfur gases remain in the atmosphere for yearsand can have a significant effect on climate. 【 】 Several large-scale volcanic events have beenrecorded, such as the 1815 eruption of Tambora and the 1991 eruption of Pinatubo, and are knownto have had climatic effects.【】However, no relationship between periods of volcanic activity andperiods of glaciation has yet been established.【】9. Look at the four squares【】that indicate where the following sentence could be added tothe passage.The former decreased global temperatures by as much as three degrees Celsius, causing thefollowing year to be known in places as the year without a summer.