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Unformatted text preview: 1. A theory is A) Is a series of ideas that can be tested B) A group of widely accepted facts C) Is a description of how something behaves D) A tentative explanation for an observation 2. A scientific theory: A. is settled and cannot be disproved. B. is the most reasonable guess that scientists can make until they can collect better data. C. can become a law when enough data are gathered. D. is a comprehensive explanation based on careful analysis of data. E. is the same as a hypothesis. 3. If a scientific theory is based on many different kinds of data, then: A. the theory is not yet precise enough and must be revised. B. different theories are needed to explain all of the different data. C. it will eventually become a law. D. it is considered well-supported. E. it is considered true and correct. 4. Radioactive decay a. Is random and predictable b. Is exponential c. Can be used to date geologic materials by measuring the amount of Parent and Daughter isotope d. Is the spontaneous breakdown of unstable isotope to a radiogenic daughter e. All of the above 5. A rock sample has 6 billion K-40 atoms (parent isotope), and 6 billion Ar-40 atoms (daughter isotope). After two half-lives, what is the content of the rock sample? a. A. 9 billion K-40 atoms and 3 billion Ar-40 atoms. b. B. 1.5 billion K-40 atoms and 10.5 billion Ar-40 atoms. c. C. 0 K-40 atoms and 12 billion Ar-40 atoms. d. D. .75 billion K-40 atoms and 11.25 billion Ar-40 atoms. e. E. 3 billion K-40 atoms and 9 billion Ar-40 atoms 6. You are ona journey to the center of Earth. How do you know when you are in the asthenosphere? a. A. The rock is solid, extremely hot, and highly pressurized. b. B. The rock is molten, extremely hot, and highly pressurized. c. C. The rock is mostly solid, but pliable, and can flow under pressure. d. D. The rock is strong, rigid, and can break when it moves. e. E. None of the above 7. Pick Correct answer about crust: a. A. Ocean crust is made of granite and is denser b. B. Continental crust made of granite and is less dense c. C. Ocean crust has a mean depth of 800 m d. D. Continental crust has a mean elevation of 4000 m e. E. The crust is good with cherry pie 8. Seafloor spreading: a. Ocean crust is created at mid-ocean ridges b. Ocean crust is destroyed in subduction zones c. Lithospheric plates sink in subduction zones d. Lithosphere contains both crust (ocean and continent) and rigid upper mantle e. All of the above 9. Which is NOT correct about the Earths magnetic field a. Last reversed 780 ka b. Is like a giant bar magnet in the center with compasses point North (normal) c. Is recorded by cooling rocks which yield + anomalies if they cooled in a normal field and anomalies if they cooled in a reversed field d. Is the result of fluid flow in the oceans e. Acts as a magnetic tape recorder/bar code for sea floor spreading 10. Which is not correct about plate tectonics: a. The Earths lithosphere is broken into rigid plates b. The oldest ocean crust is ~200 million years old...
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This note was uploaded on 01/19/2012 for the course GEOL 123 taught by Professor Kim during the Winter '11 term at Bowling Green.
- Winter '11