How the Dinosaurs Actually Went Extinct

What were some immediate effects of the asteroid impact that led to the extinction event?

• Global warming and increased plant growth

• Molten glass raining down, ash and dust clouds, and acid rain

• Formation of new mountain ranges and volcanic eruptions

• Rapid growth of new species and expansion of oceans

What percentage of dinosaurs disappeared during the K-Pg extinction event?

• 20%

• 50%

• 60%

• 100%

What rare element found in a specific clay layer around the world helped scientists hypothesize about an asteroid impact?

• Gold

• Iron

• Iridium

• Carbon

Where is the Chicxulub Crater, believed to be the impact site of the asteroid that caused the K-Pg extinction event?

• Off the coast of Mexico's Yucatan Peninsula

• In the middle of the Pacific Ocean

• In Siberia, Russia

• In the Sahara Desert

What is the main idea of the Alvarez Hypothesis regarding the extinction of dinosaurs?

• A massive volcanic eruption caused global cooling.

• A large asteroid impact caused widespread destruction and climate change.

• Dinosaurs were unable to adapt to changing ocean levels.

• Competition for resources led to the decline of dinosaur populations.

How did the massive volcanic eruptions from the Deccan Traps likely contribute to the climate changes around the time of the dinosaur extinction?

• They caused the oceans to disappear, leading to marine regression.

• They released ash and dust into the atmosphere, blocking sunlight and altering weather patterns.

• They created new landmasses, increasing competition among dinosaurs.

• They directly caused the asteroid impact that killed the dinosaurs.

What characteristic of dinosaur physiology might have made them less adaptable to sudden temperature changes compared to other animals?

• They were strictly cold-blooded and couldn't regulate their body temperature.

• They were warm-blooded like modern birds, requiring constant high temperatures.

• Their metabolism was likely somewhere between cold-blooded and warm-blooded, making them less adaptable than mammals.

• They had very slow metabolisms, which made them less efficient at finding food.

What is marine regression, and how did it affect the Earth's environment around the time of the dinosaur extinction?

• It was a period of increased volcanic activity that created new ocean floor.

• It involved the ocean floor dropping, causing sea levels to fall and exposing vast amounts of land.

• It was a sudden warming of ocean temperatures, leading to coral bleaching.

• It described the movement of continents, which changed ocean currents.