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1. Scientists can determine if oxygen existed in Earth’s Archean atmosphere byA. looking at the amount of salt content in rocks.B. determining the lack of oxidation that occurred.C. looking for oxidized iron in rocks.D. determining how many people survived.2. The greenhouse effect is related to the phenomenon of an increase in average surface temperature known asA. conservation.B. agricultural improvement.C. air pollution.D. global warming.3. In addition to possibly releasing harmful chemicals in the environment, mining is consideredA. the most dangerous job in the United States.B. the least lucrative job in the United States.C. the least dangerous job in the United States.D. the most lucrative job in the United States.4. Which of the following resources is a nonrenewable resource?A. TreeB. GoldC. CarbonD. River5. The Cenozoic Era is also referred to as theA. Age of Dinosaurs.B. Age of Fish.C. First Era.D. Age of Mammals.6. The building blocks of proteins are known asA. oxygen.B. euphoric acid.C. amino acids.D. carbon dioxide.7. Ancient cyanobacteria released ______, which assisted in creating the atmosphere as we know it today.A. oreB. leadC. oxygenD. hydrogen8. Geologist James Hutton argued that the geologic processes occurring today have occurred since the formation of Earth. This idea is known asA. uniformitarianism.B. principle of inclusions.C. original horizontality.D. superposition.9. A substance that enters Earth’s cycles and does harm to living things isA. freshwater.B. a pollutant.C. hydrogen.D. oxygen.10. The principle that states the undisturbed rock sequence has the oldest rocks on the bottom is known asA. original parallelism.B. original juxtaposition.C. superposition.D. relative age dating.11. The microscopic organisms at the base of the marine food chain are known asA. terrestrial animals.B. plant life.C. phytoplankton.D. primitive life.12. Small fragments of orbiting bodies that have fallen on Earth’s surface are known asA. uranium.B. zirconium.C. meteorites.D. asteroids.13. Sand or gravel that naturally forms near Earth’s surface is known asA. pollen.B. ore.C. bedrock.D. aggregate.14. The resources that are provided by Earth are known as _______ resources.A. naturalB. renewableC. nonrenewableD. synthetic15. A natural resource that is mined for profit is calledA. ore.B. topsoil.C. aggregate.D. sand.16. The ancient geographic setting of an area is known as itsA. transgression.B. phytoplankton.C. passive margin.D. paleogeography.17. The combination of sulfur dioxide, nitrogen oxide, and atmospheric moisture createsA. acid rain.B. pesticides.C. drinking water.D. smog.18. In addition to being necessary for respiration, _______ also provides UV radiation protection.A. oxygenB. carbon dioxideC. hydrogenD. water19. Fuels derived from living things are known asA. synthetic fuels.B. hybrid fuels.C. biomass fuels.D. electricity.20. Geologists have divided Earth’s history into time units, which are largely based onA. fossils.B. written correspondences.C. oral histories.D. climates.

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