Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Transcribed Image Text:**Understanding Radiometric Decay of Carbon-14**
**Question:**
Radiometric decay of carbon-14 would be used in dating:
- ○ sedimentary rock.
- ○ a trace fossil.
- ○ an insect in amber.
- ○ a fossil imprint.
- ○ igneous rock.
**Explanation:**
Radiometric dating, specifically using the decay of carbon-14, is a method used to determine the age of an object containing organic material by measuring the properties of radiocarbon (carbon-14). This technique is particularly useful for dating materials that are up to about 50,000 years old.
Carbon-14 dating is commonly used in:
- Organic remains such as bone, wood, or leather.
- Archaeological artifacts of biological origin, such as remains of animals or plants.
It is less useful or not applicable for dating:
- Sedimentary rock, as it is composed of particles from other rocks and minerals, making it challenging to date using carbon-14.
- Igneous rock, because these rocks form from molten material and typically do not contain carbon-14.
For fossils such as a trace fossil, an insect in amber, or a fossil imprint, carbon-14 dating is considered if the fossil contains organic material. However, in practice, fossils are usually too old for carbon-14 dating and other methods like uranium-lead or potassium-argon dating are used.
In summary, carbon-14 is mainly used for dating organic remains and not typically for sedimentary or igneous rocks.
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