Integrated Science
7th Edition
ISBN: 9780077862602
Author: Tillery, Bill W.
Publisher: Mcgraw-hill,
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Question
Chapter 22.5, Problem 11SC
To determine
The geologic time in which the least number of fossils in rocks are expected to be present.
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Check out a sample textbook solutionStudents have asked these similar questions
1. How old is a rock if the mineral biotite from the rock has 85,000 40K atoms and 15.000 40Ar
atoms? Note: 40K decays to 40Ar with half-life = 1.3 billion years.
2. Isotopic analysis of a granitic intrusion indicates that 6.25 % of the original 40K is present.
Analysis of a nearby basaltic intrusion indicates that 25 % of the original amount of 40K is
present. What is the absolute age of both the granitic intrusion and the dike? What is the
relationship between them?
I.
3. Pebbles of an igneous rock are incorporated within a conglomerate. The pebbles yield a
radiometric age of 200 million years. What can you say about age of the conglomerate based
on this data?
4. A radioactive parent isotope with 600 atoms. After the decay, 450 daughter atoms were
produced. Calculate the age of the rock if you know that the half-life of the parent isotope is
20 million years.
The diagram below shows the layers of rock having an ammonite:
Which statement about the rock fossils is true? (4 points)
a
Fossil Y is older than fossil X.
b
Fossil Z is younger than fossil Y.
c
Fossil Z existed over many periods of time.
d
Fossil Y existed during the same period as the ammonite.
What describes using organisms that were only alive during a specific time period to estimate the unknown age of items?
a.
Radioactive dating
Selected:b.
Law of superposition
This answer is incorrect.
c.
Relative dating
d.
Index fossils
Chapter 22 Solutions
Integrated Science
Ch. 22.1 - The three main kinds of living things. Bacteria,...Ch. 22.1 - Which is commonly used as a source of information...Ch. 22.2 - Prob. 3SCCh. 22.2 - Which of the following kingdoms contain members...Ch. 22.2 - Prob. 5SCCh. 22.3 - Prob. 6SCCh. 22.4 - Prob. 7SCCh. 22.5 - Some of the oldest fossils are about how many...Ch. 22.5 - Prob. 9SCCh. 22.5 - Prob. 10SC
Ch. 22.5 - Prob. 11SCCh. 22.5 - Prob. 12SCCh. 22.6 - In the evolution of humans, the fossil evidence...Ch. 22.6 - Prob. 14SCCh. 22.6 - Prob. 15SCCh. 22 - How do the domains Bacteria and Archaea differ?Ch. 22 - Prob. 2CQCh. 22 - Prob. 3CQCh. 22 - Prob. 4CQCh. 22 - List two characteristics typical for each of the...Ch. 22 - Prob. 6CQCh. 22 - Develop a phylogeny for motor vehicles and draw a...Ch. 22 - Prob. 8CQCh. 22 - What major event marked the end of the Paleozoic...Ch. 22 - Describe how the principles of superposition,...Ch. 22 - Prob. 11CQCh. 22 - Prob. 12CQCh. 22 - What are some of the major steps thought to have...Ch. 22 - Prob. 15CQCh. 22 - Prob. 1PEACh. 22 - Prob. 2PEACh. 22 - Prob. 3PEACh. 22 - Prob. 4PEACh. 22 - Prob. 1PEBCh. 22 - Prob. 2PEBCh. 22 - Prob. 3PEBCh. 22 - Prob. 4PEB
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- What is obtained when rocks and geologic events are put into chronologic order without regard to the actual dates? (24.2) (a) absolute (numerical) geologic time (b) relative geologic time (c) a geologic formation (d) a correlation periodarrow_forwardSuppose that one species of index fossil lived between 410 and 380 mya and another lived between 440 and 350 mya. What can be said about the age of a rock that contains fossils of both species? Figure 24.22 Absolute Dating of Sedimentary Rocks See Exercise 7.arrow_forwardWhat biologic event is used by geologists to separate the Tertiary period from the Quaternary period?arrow_forward
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