1. Geologists have divided Earth's history into time units, which are largely based on
A. fossils.
B. written correspondences.
C. oral histories.
D. climates.
2. What is the most abundant fossil fuel?
A. Gas
B. Coal
C. Oil
D. Wood
3. The principle that states the undisturbed rock sequence has the oldest rocks on the bottom is known as
A. superposition.
B. original juxtaposition.
C. relative age dating.
D. original parallelism.
4. In addition to being necessary for respiration, also provides UV radiation protection.
A. hydrogen
B. carbon dioxide
C. oxygen
D. water
5. The building blocks of proteins are known as
A. carbon dioxide.
B. amino acids.
C. oxygen.
D. euphoric acid.
6. In addition to possibly releasing harmful chemicals in the environment, mining is considered
A. the most lucrative job in the United States.
B. the least lucrative job in the United States.
C. the most dangerous job in the United States.
D. the least dangerous job in the United States.
7. The resources that are provided by Earth are known as resources.
A. synthetic
B. renewable
C. natural
D. nonrenewable
8. The time units used by scientists to divide Earth's history are part of the
A. 24-hour model.
B. geologic time scale.
C. 360° latitude.
D. 180° longitude.
9. The loss of topsoil in very dry areas of the world is known as
A. water intensification.
B. desertification.
C. soil intensification.
D. soil inhabitation.
10. Which colorless and odorless gas, produced by radioactive decay of Uranium-238, is considered to be a cancer-causing agent?
A. Boron
B. Radon
C. Oxygen
D. Hydrogen
11. The microscopic organisms at the base of the marine food chain are known as
A. terrestrial animals.
B. phytoplankton.
C. primitive life.
D. plant life.
12. The greenhouse effect is related to the phenomenon of an increase in average surface temperature known as
A. air pollution.
B. agricultural improvement.
C. global warming.
D. conservation.
13. When new clay sediment is deposited on top of old beach material, it's known as
A. regression.
B. aggression.
C. progression.
D. transgression.
14. Fuels derived from living things are known as
A. biomass
fuels. B. hybrid
fuels. C.
electricity.
D. synthetic fuels.
15. A substance that enters Earth's cycles and does harm to living things is
A. a pollutant.
B. freshwater.
C. oxygen.
D. hydrogen.
16. Scientists can determine if oxygen existed in Earth's Archean atmosphere by
A. determining how many people survived.
B. looking at the amount of salt content in rocks.
C. determining the lack of oxidation that occurred.
D. looking for oxidized iron in rocks.
17. The change in isotopes over time due to the emission of radioactive particles is known as
A. radioactive decay.
B. absolute-age dating.
C. half-life.
D. radiometric dating.
18. Small fragments of orbiting bodies that have fallen on Earth's surface are known as
A. asteroids.
B. meteorites.
C. zirconium.
D. uranium.
19. Which of the following resources is a nonrenewable resource?
A. River
B. Tree
C. Carbon
D. Gold
20. The ancient geographic setting of an area is known as its
A. phytoplankton.
B. transgression.
C. paleogeography.
D. passive margin.