Life: The Science of Biology
11th Edition
ISBN: 9781319010164
Author: David E. Sadava, David M. Hillis, H. Craig Heller, Sally D. Hacker
Publisher: W. H. Freeman
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Chapter 24.1, Problem 2R
Summary Introduction
To explain:
Mark boundaries between the sites given in Figure, which were formed, during the same geological time period.
Given:
Table 1 given below shows the ratio between the 206Pb and 238U and the estimated age of the sites given.
Introduction:
The ratio of 206Pb to 238U is known as uranium and lead dating. It is a radioactive dating technique used in earlier times to date the rocks that are formed in between 1 million years to 4.5 billion years ago. The number of radioactive isotopes of uranium and amount of other materials into which the radioactive isotopes would be decompose.
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The most useful method for dating ancient calcium rich cave deposits would be
Group of answer choices
A: Argon-Argon Dating
B: Paleomagnetic Reversals
C: Electron Spin Resonance Dating
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E: Potassium-Argon Dating
Radiometric dating does not measure the age of an individual atom. It is a measure of the age of a quantity of atoms—a statistic. As with any statistical measure, its values may deviate around an average (sampling error, Section 1.8). Imagine that one sample of rock is dated ten different ways. Nine of the tests yield an age close to 225,000 years. One test yields an age of 3.2 million years. Do the nine consistent results imply that the one that deviates is incorrect, or does the one odd result invalidate the nine that are consistent?
Which 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 Gorge
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