Our Origins: Discovering Physical Anthropology (Fourth Edition)
4th Edition
ISBN: 9780393614008
Author: Clark Spencer Larsen
Publisher: W. W. Norton & Company
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Chapter 8, Problem 4SQ
Summary Introduction
Introduction: Dating is a technique used in archeology for ascertaining the fossil's age, artifacts, and some precious items. It can be classified into two broad categories, including absolute and relative dating.
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Which of the following is NOT true for relative dating methods:
A. Relies on observational skills
B. Includes stratigraphy which is based on ordered layers that build up over time
C. Determines if one artifact or fossil is older than another
D. Gives you specific dates of the artifact or fossil
In which type of rock are you most likely to find a fossil? a. basalt, a dark, fine-grained volcanic rock b. limestone, composed of sedimented calcium carbonate c. slate, a volcanically melted and cooled shale d. granite, which forms by crystallization of magma cooling below Earth’s surface
Radiometric dating uses the decay of to to determine how old fossils of biological material are using the rate of decay.
Group of answer choices
14C, 12C
14N, 12C
12C, 14N
14C, 14N
Chapter 8 Solutions
Our Origins: Discovering Physical Anthropology (Fourth Edition)
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- Which of the following techniques examines the decay of carbo an object? A. Radiometric dating B. Mesozoic dating O C. Relative dating D. Precambrian dating O Oarrow_forwardExplain why it is difficult to use carbon-14 dating on 100-million-year-old dinosaur fossilsarrow_forwardWhich bits of evidence would convince you that life originated as early as 3.2 bya? a. You look at a microfossil under a scanning electron microscope and it is the same shape as a cell. b. A high-quality transmission electron micrograph of a fossil cell reveals cellular compartments, including a possible nucleus. c. Potassium dating of a fossil containing a possible cell indicates that the fossil is 3.2 billion years old. d. Using transmission and scanning electron microscopy, you find evidence of a carbon-based material in what appears to be a cell wall of a fossil isotopically dated as 3.2 billion years old.arrow_forward
- Explain how radiometric dating is used to estimatethe age of a fossil.arrow_forwardWhich item is best dated using the potassium-argon (K-Ar) method? Group of answer choices A: Cave layers in South Africa B: stone tools C: Ancient dinosaur bones D: organic materials E: Lava flows found in the Olduvai Gorgearrow_forwardIn radiometric dating, scientists use the half-life of a radioactive isotope, to determine the approximate age of rocks, and the fossils that are embedded in them. Half-life is the time it takes for half of a radioactive element to become stable.Uranium 238 (238U) is a radioactive element that decays into Lead (206Pb) after 4.5 billion years. 6) Scientists found a fossil in a layer of rock that tested as 1/8th U and 7/8th Pb. What is the approximate age of the fossil? A) 562 million years old B) 4.5 billion years old C) 9 billion years old D) 13.5 billion years old Not Gradedarrow_forward
- What kinds of tool artifacts were found in the cave near Denisovan specimens? A. Lithic cores B. Levallois cores C. Oldowan Choppers D. Both A and B E. Both A and Carrow_forwardwhat is a mold? A. the imprints from an organism can be a shell or the skin of an animal B. Molds fill in with sediment that hardens into rock. C. naturally preserved remains D. Organisms preserved in materials such as amberarrow_forwardOrganism A lived from 410 to 60 million years ago. Organism B lived from 200 to 100 million years ago. Which organism will be the better index fossil? (1)arrow_forward
- A. How old is the Earth? B. How long did the longest eon (so far) last? C. How many years ago did the most recent epoch begin? D. How many mass extinction events has the Earth witnessed so far?arrow_forwardWhy are indices better than simple measurements for comparing fossil specimensarrow_forwardWhat are the challenges of estimating the ages of old fossils?Explain how these challenges may be overcome in somecircumstances.arrow_forward
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