Conceptual Physical Science Explorations
2nd Edition
ISBN: 9780321567918
Author: Paul G. Hewitt, Leslie A. Hewitt, John A Suchocki
Publisher: Addison Wesley
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Textbook Question
Chapter 29, Problem 4RQ
In a sequence of sedimentary rock layers, the oldest layer is on the bottom and the youngest layer is at the top. What relative dating principle is this?
Expert Solution & Answer
To determine
The relative dating principle used in a sequence of sedimentary rock layers, the oldest layer is on the bottom and the youngest layer is at the top.
Answer to Problem 4RQ
Original horizontality, also known as the principle of superposition, states that older layers of sedimentary rock got deposited first. Then all the layers got deposited one after another over the initially formed layer. Hence, lower layers of sedimentary rocks are older than the upper layers.
Explanation of Solution
Sedimentary rocks are formed by the deposition of different layers of sediments one over another. This is an along process. The upper layer has been deposited over the lower (older) layer.
So, it can be said that the upper layer is relatively younger than the lower. This can be understood by the principle of original horizontality or the principle of superposition.
According to the principle of Original horizontality, sediments get deposited on the horizontal surfaces. On this layer, other layers got deposited one after another. Therefore, the layer which is in the bottom is older than that of the layer, which is on the top.
Conclusion:
Thus, Original horizontality, also known as the principle of superposition, states that older layers of sedimentary rock got deposited first. Then all the layers got deposited one after another over the initially formed layer. Hence, lower layers of sedimentary rocks are older than the upper layers.
Chapter 29 Solutions
Conceptual Physical Science Explorations
Ch. 29 - Prob. 1RQCh. 29 - A granitic dike is found across a sandstone layer....Ch. 29 - How are fossils used in determining geologic time?Ch. 29 - In a sequence of sedimentary rock layers, the...Ch. 29 - What is radioactive half-life?Ch. 29 - What are the half-lives of uranium-238,...Ch. 29 - Which of the geologic time units spans the...Ch. 29 - Prob. 8RQCh. 29 - Prob. 9RQCh. 29 - Prob. 10RQ
Ch. 29 - Prob. 11RQCh. 29 - Why are the lobe-finned fishes significant?Ch. 29 - Prob. 13RQCh. 29 - What animals group evolved from the amphibians...Ch. 29 - Prob. 15RQCh. 29 - Prob. 16RQCh. 29 - What evidence supports the meteorite impact at the...Ch. 29 - Which epochs make up the tertiary period? The...Ch. 29 - Prob. 19RQCh. 29 - Prob. 20RQCh. 29 - What six principles are used in relative dating?Ch. 29 - Why dont all rock formations show a continuous...Ch. 29 - Prob. 3TECh. 29 - Prob. 4TECh. 29 - Prob. 5TECh. 29 - What was the most noteworthy evidence of life in...Ch. 29 - Prob. 7TECh. 29 - Why are internal nostrils in the lobe-finned...Ch. 29 - What time period is associated with coal deposits?Ch. 29 - Prob. 10TECh. 29 - Prob. 11TECh. 29 - How does the element iridium relate to the time of...Ch. 29 - Suppose you see a sequence of sedimentary rock...Ch. 29 - If a sedimentary rock contains inclusions of...Ch. 29 - Which isotopes are most appropriate for dating...Ch. 29 - Before the discovery of radioactivity, how did...Ch. 29 - Prob. 17TECh. 29 - Prob. 18TECh. 29 - Prob. 19TECh. 29 - Prob. 20TECh. 29 - The principle of superposition is that each new...Ch. 29 - Life forms throughout Earths past have occurred in...Ch. 29 - The time it takes for 50 of a radioactive...Ch. 29 - Development of Earths ocean was likely due to (a)...Ch. 29 - Prob. 5RATCh. 29 - Prob. 6RATCh. 29 - Prob. 7RATCh. 29 - The formation of the supercontinent Pangaea (a)...Ch. 29 - Prob. 9RATCh. 29 - Prob. 10RAT
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