quiz
...n 6. Which type of extinctions did Walter and Luis Alvarez study? a. Cretaceous extinctions b. Permian extinctions c. Insect extinctions d. Small extinctions 7. Which of the following is NOT a way in which fossils may form? a. Hard parts that are rich in minerals may remain b. Thin films pressed between layers of sandstone and shale c. Getting caught in tree sap d. Rocks forming a replica of an organism 8. In which era of time did humans appear? a. Paleozoic b. Mesozoic c. Cenozoic d. Back in the day 9. Paleontologist use half-lives to: a. Date fossils b. Tell time c. Predict the future d. Bomb foreign countries 10. Plate tectonics is the theory that Earth's outer layer is made up of plates, which have moved throughout Earth's history. Evidence: The shapes match The plants and animals match The rocks match The ice matches The positions do not match Paleontologists use radioactive isotopes with longer half-lives to date older fossils Researchers can use the concentrations to date volcanic rocks Paleontologists use these measurements to date very old fossils found near volcanic rock The organic substances of a dead organism burie...