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test questions - Chapter 9 1 The act of placing rocks in...

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Chapter 9 1. The act of placing rocks in their proper sequence of formation is called __________. absolute dating correlation cross-cutting relative dating principle of original horizontality 2. To assume that rock layers that are inclined have been moved into that position by crustal disturbances is to apply a principle of relative dating known as cross-cutting relationships. (T/F) 3. What fundamental principle of geology did Nicolaus Steno propose in 1669? law of superposition principle of cross-cutting relationships principle of inclusion uniformitarianism principle of original horizontality 4. To state that "in an undeformed sequence of sedimentary rocks the oldest rock is at the bottom" is to use a basic principle of relative dating called the law of superposition. (T/F) 5. Most layers of sediment are deposited in a horizontal position. (T/F) 6. An igneous rock that cuts through a sedimentary rock must be younger than that sedimentary rock. This is an example of __________. cross-cutting relationships original horizontality unconformity superposition inclusion 7. An unconformity is a break in the rock record during which deposition ceased, erosion removed previously formed rocks, and then deposition resumed. (T/F) 8. Pieces of one rock unit contained within another are called inclusions. (T/F) 9. When magma works its way into a rock and crystallizes, we can assume that the intrusion is younger than the rock that has been intruded. (T/F) 10. A break in the rock record where the deposition of sediment has been interrupted is referred to as a(n) __________. Intrusion Inclusion Isotope Unconformity cross-cutting relationship 11. No place on Earth has a complete set of conformable strata. (T/F) 12. The "matching-up" of rocks from similar ages but different regions is referred to as correlation. (T/F)
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13. Which fundamental geologic principle allows geologists to use the remains of organisms when correlating rock units? Uniformitarianism Inclusion fossil succession cross-cutting relationships original horizontality 14. The fact that fossils succeed one another in a definite and determinable order is known as the principle of fossil succession. (T/F) 15. Atoms of the same element that contain different numbers of neutrons are called __________. Radioactivity Nuclei Ions alpha particles isotopes 16. __________ is the result of the spontaneous decay of an atom's nucleus. Correlation Succession Inclusion Radioactivity Superposition 17. Of the three rock types, igneous rocks are more suitable for radiometric dating than sedimentary rocks. (T/F) 18. The complete decay of uranium eventually produces a stable daughter consisting of the element __________. Argon Strontium Lead Rubidium Thorium 19. Using radioactive isotopes to calculate the ages of rocks and minerals is a procedure called radiometric dating. (T/F) 20. If the ratio of parent isotope to daughter isotope is 1:7, __________ half-lives have elapsed.
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