What Was The Alvarez Theory? theory” formulated by American scientists Walter Alvarez and Luis Alvarez. This theory states that a bolide (meteorite or comet) impact may have triggered the extinction event by ejecting a huge quantity of rock debris into the atmosphere, enshrouding Earth in darkness for several months or longer. What was the idea
What Are Three Pieces Of Evidence Used To Support The Theory That Dinosaurs Became Extinct As A Result Of A Comet Impact About 65 Million Years Ago Apex? toxic volcanic gases and dust. asteroid impact. food shortage. climate change. What are three pieces of evidence used to support the theory that dinosaurs became extinct? Abundant
How Do Scientists Believe Dinosaurs Became Extinct? Geological evidence indicates that dinosaurs became extinct at the boundary between the Cretaceous and Paleogene eras, about 66 million years ago, at a time when there was worldwide environmental change resulting from the impact of a large celestial object with the Earth and/or from vast volcanic eruptions. How
What Caused The Cretaceous-Tertiary Extinction? The Cretaceous-Tertiary extinction event What caused the third extinction? Warming of the Earth’s climate and associated changes to oceans were the most likely causes of the extinctions. At the end of the Permian Period volcanic activity on a massive scale in what is now Siberia led to a huge outpouring
What Caused The End Cretaceous Mass Extinction? Many scientists believe that the collision of a large asteroid or comet nucleus with Earth triggered the mass extinction of the dinosaurs and many other species near the end of the Cretaceous Period. What was the cause of the end Cretaceous extinction? As originally proposed in 1980 by
Did Sharks Exist With Dinosaurs? Did sharks exist with dinosaurs? Today’s sharks are descended from relatives that swam alongside dinosaurs in prehistoric times. In fact, the largest predator of all time was a shark called a Megalodon. It lived just after the dinosaurs, 23 million years ago, and only went extinct 2.6 million years ago.