Physical Science (12th Edition), Standalone Book
12th Edition
ISBN: 9781260150544
Author: Bill W. Tillery
Publisher: McGraw Hill Education
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Question
Chapter 21, Problem 17AC
To determine
From the following options, the smallest block of time assigned to the geologic time period is called:
eon.
period.
era.
epoch.
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Chapter 21 Solutions
Physical Science (12th Edition), Standalone Book
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 - Prob. 5FFACh. 21 -
6. The history of Earth has been one of many...Ch. 21 - Prob. 1PEACh. 21 - Prob. 2PEACh. 21 - Prob. 3PEACh. 21 - Prob. 4PEACh. 21 - Prob. 5PEACh. 21 - Prob. 6PEACh. 21 - Prob. 7PEACh. 21 - Prob. 8PEACh. 21 - Prob. 9PEACh. 21 - Prob. 10PEACh. 21 - Prob. 11PEACh. 21 - Prob. 12PEACh. 21 - Prob. 13PEACh. 21 - Prob. 14PEACh. 21 - Prob. 15PEACh. 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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- 1. What is relative dating? 2. What is the law of superposition? 3. What is the law of original horizontally?arrow_forward5. The diplodocus dinosaur is believed to have become extinct approximately 1.38x10° years ago. The oviraptor is believed to have become extinct approximately 7x10' years ago. How many years were there between the extinction of these two dinosaur types?arrow_forward12. Which part of the earth makes up about one-third of earth’s total mass and is mostly iron witha solid part and a part that acts like a liquid?A. mantle B. core C. crust D. asthenospherearrow_forward
- 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.arrow_forwardWhich of the following is most responsible for the formation of new crust ar the edge of a tectonic plate? A. mountain building at a continent-continent convergent boundary B. magma rising up from the mantle at a divergent boundary С. two tectonic plates sliding past one another at a transform boundary D. subduction of one oceanic plate under another at a convergent boundaryarrow_forward3. The Duggs find the skeleton of a Zillow beast and wish to carbon date it. If the half life of Carbon-14 is 5700 years, and we measure 60% of the original carbon, how old is the Zillow beast fossil?arrow_forward
- 11. Which part of the Earth is a hot, elastic semi-liquid layer that extends around the entire Earth?A. crust B. core C. mantle D. asthenospherearrow_forwardEarth's surface area is 5.10x10^8 km^2 .Earth's crust has a thickness (or depth) of 35 km and density 2.8 g/cm^3 for earth's crust. a) Calculate the volume of earth's crust in km^3 b) Express your answer from part (a) in cm^3 c) Calculate the mass of the crust tons (t) : 1 ton=1000kg d) Silicon's concentration in earth's crust is 2.72x105grams/ton. Calculate the mass of silicon (in grams) present in earth's crust.arrow_forwardFrom Hawaii to the bend in the Hawaiian-Emperor chain is about 4000 km. Use the speed of Pacific plate motion given in Problem 7 to estimate how long ago the direction of plate motion changed. (Note: It may not be a coincidence that the San Andreas fault became active in what is now Southern California at about the same time.) 7. The Hawaiian-Emperor chain of undersea volcanoes is about 7500 km long, and the Pacific plate is moving 9.2 cm a year. How old is the oldest detectable volcano in the chain? What has happened to older volcanoes in the chain?arrow_forward
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