Physical Science
11th Edition
ISBN: 9780077862626
Author: Bill Tillery, Stephanie J. Slater, Timothy F. Slater
Publisher: McGraw-Hill Education
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Chapter 21, Problem 30AC
To determine
The geologic time scale identified major blocks of time in Earth’s past is given from the following options:
major worldwide extinctions of life on Earth.
the beginning of radioactive decay of certain unstable elements.
measuring reversals in Earth’s magnetic field.
None of the above is correct.
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Chapter 21 Solutions
Physical Science
Ch. 21 -
1. Evidence of former life is called...Ch. 21 -
2. In the early 1800s, William Smith noted that...Ch. 21 - Prob. 3ACCh. 21 -
4. The meaning of the word fossil is
a. petrified...Ch. 21 - Prob. 5ACCh. 21 - Prob. 6ACCh. 21 -
7. Fossils are most often found in what type...Ch. 21 - Prob. 8ACCh. 21 - Prob. 9ACCh. 21 - Prob. 10AC
Ch. 21 -
11. Distinctive fossils of plants or animals that...Ch. 21 - Prob. 12ACCh. 21 - Prob. 13ACCh. 21 - Prob. 14ACCh. 21 - Prob. 15ACCh. 21 - Prob. 16ACCh. 21 - Prob. 17ACCh. 21 - Prob. 18ACCh. 21 - Prob. 19ACCh. 21 - Prob. 20ACCh. 21 - Prob. 21ACCh. 21 - Prob. 22ACCh. 21 - Prob. 23ACCh. 21 - Prob. 24ACCh. 21 - Prob. 25ACCh. 21 -
26. Which of the basic guiding principles used to...Ch. 21 - Prob. 27ACCh. 21 - Prob. 28ACCh. 21 -
29. Correlation and relative dating of rock units...Ch. 21 - Prob. 30ACCh. 21 -
31. You would expect to find the least number of...Ch. 21 - Prob. 32ACCh. 21 - Prob. 33ACCh. 21 - Prob. 34ACCh. 21 -
35. An early record about the discovery of...Ch. 21 - Prob. 36ACCh. 21 - Prob. 37ACCh. 21 -
38. A geologic feature that cuts across or is...Ch. 21 - Prob. 39ACCh. 21 - Prob. 40ACCh. 21 - Prob. 41ACCh. 21 - Prob. 42ACCh. 21 - Prob. 43ACCh. 21 - Prob. 44ACCh. 21 - Prob. 45ACCh. 21 - Prob. 46ACCh. 21 -
1. What is the principle of uniformity? What are...Ch. 21 -
2. What is the geologic time scale? What is the...Ch. 21 -
3. Why does the rock record go back only 3.8...Ch. 21 -
4. Do igneous, metamorphic, or sedimentary rocks...Ch. 21 -
5. What major event marked the end of the...Ch. 21 -
6. Briefly describe the principles and...Ch. 21 - Prob. 7QFTCh. 21 -
8. Describe how the principles of superposition,...Ch. 21 - Prob. 9QFTCh. 21 - Prob. 10QFTCh. 21 -
11. Describe some of the things that fossils can...Ch. 21 -
1. Analyze the significant reasons that a pot...Ch. 21 - Prob. 2FFACh. 21 -
4. What are the significant differences between...Ch. 21 -
5. Summarize why the different blocks of time...Ch. 21 -
6. The history of Earth has been one of many...Ch. 21 -
1. A sequence of deep marine shale that spans the...Ch. 21 - Prob. 2PEBCh. 21 - Prob. 3PEBCh. 21 -
4. The absolute age of a rock is its age in...Ch. 21 -
5. The absolute age (age in years) of sedimentary...Ch. 21 -
6. A sequence of rocks consists of a flat-lying...Ch. 21 -
7. A student examining a roadcut excavated...Ch. 21 - 8. A cliff has the following sequence...Ch. 21 - Prob. 9PEBCh. 21 - Prob. 10PEBCh. 21 - Prob. 11PEBCh. 21 - Prob. 12PEBCh. 21 - Prob. 13PEBCh. 21 - Prob. 14PEBCh. 21 -
15. Two outcrops separated by a distance of 32 km...
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