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Penn Foster Exam Answers TUTORIAL: Includes final exam guide with answers for final exam. Individual Assignment: Geologic Time 007529 Penn Foster Answers 007529RR 007529 Geologic Time

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SAMPLE PRACTICE EXAM QUESTIONS IN STUDY GUIDE 1. A substance that enters Earth’s cycles and does harm to living things is A. hydrogen. B. freshwater. C. oxygen. D. a pollutant. 2. The time units used by scientists to divide Earth’s history are part of the A. geologic time scale. B. 180° longitude. C. 24-hour model. D. 360° latitude. 3. The greenhouse effect is related to the phenomenon of an increase in average surface temperature known as A. agricultural improvement. B. air pollution. C. global warming. D. conservation. 4. When new clay sediment is deposited on top of old beach material, it’s known as A. regression. B. progression. C. aggression. D. transgression. 5. The building blocks of proteins are known as A. oxygen. B. euphoric acid. C. amino acids. D. carbon dioxide. 6. The ancient geographic setting of an area is known as its A. paleogeography. B. transgression. C. passive margin. D. phytoplankton.

7. Geologists have divided Earth’s history into time units, which are largely based on A. fossils. B. oral histories. C. climates. D. written correspondences. 8. The resources that are provided by Earth are known as _______ resources. A. nonrenewable B. renewable C. synthetic D. natural 9. Which colorless and odorless gas, produced by radioactive decay of Uranium-238, is considered to be a cancer-causing agent? A. Hydrogen B. Radon C. Boron D. Oxygen 10. Ancient cyanobacteria released ______, which assisted in creating the atmosphere as we know it today. A. hydrogen B. ore C. oxygen D. lead 11. The loss of topsoil in very dry areas of the world is known as A. soil intensification. B. water intensification. C. soil inhabitation. D. desertification. 12. What is the most abundant fossil fuel? A. Oil B. Wood C. Gas D. Coal

13. Small fragments of orbiting bodies that have fallen on Earth’s surface are known as A. meteorites. B. zirconium. C. uranium. D. asteroids. 14. The principle that states the undisturbed rock sequence has the oldest rocks on the bottom is known as A. superposition. B. original parallelism. C. original juxtaposition. D. relative age dating. 15. A natural resource that is mined for profit is called A. ore. B. topsoil. C. sand. D. aggregate. 16. The microscopic organisms at the base of the marine food chain are known as A. phytoplankton. B. terrestrial animals. C. plant life. D. primitive life. 17. What is the oldest and most stable part of a continent? A. Crust B. Pluton C. Craton D. Shield 18. Scientists can determine if oxygen existed in Earth’s Archean atmosphere by A. determining how many people survived. B. determining the lack of oxidation that occurred. C. looking for oxidized iron in rocks. D. looking at the amount of salt content in rocks.

19. Another name for unicellular organisms that dominated Earth up to the Precambrian time is A. prokaryotes. B. eukaryotes. C. cyanobacteria. D. stromatolites. 20. The process to convert seawater into freshwater is known as A. desalination. B. deforestation. C. salination. D. desertification.

Penn Foster Exam Answers 007529 Geologic Time