GuidedReadingnotes:Chapter3:Section2-RelativeAgesofRocksand
Section3AbsoluteAgesofRocks
Use pages 78- 83 or the glossary. Use the Modified Frayer Model to define the following words:
principle of superposition, relative age, unconformity
Read pages 78-83. Answer the questions.
1. Explain the principle of superposition. (Hint pg 79 at top).
2. How do geologist determine the relative ages of rocks and other structures?
3. What is another clue geologists use to determine the relative ages of rocks?
4. Illustrate and describe an angular unconformity (Figure 13 pg. 80)
5. What is a disconformity?
6. What is a nonconformity?
7. Geologists can often _______________________ or ___________________, layers of rocks
over great distances.
8. What is the evidence geologist use for correlation of rock layers when the rock layer isn’t
continuous?
Section 3: Read pages 85-89. Answer the Questions.
1. What is absolute age?
2. What particle’s make up an atom’s nucleus?
3. What is an isotope?
4. What is radioactive decay
5. What is a half-life?
6. Scientist use ______________________ dating to find the absolute age of a rock.
7. What is Carbon-14 useful for?
8. What is the age of the oldest known rocks on Earth?
9. What is the principle of uniformitarianism?
10. What two changes do scientist recognizes has shaped the Earth?