Earth Science: Geology, the Environment, and the Universe

Section 3: Absolute-Age Dating of Rocks

Absolute-Age Dating of Rocks

1
According to the table, what is the half-life of Thorium-234?
Days Elapsed Grams Of Thorium – 234 Remaining
016
1211
248
366

A)8 days
B)20 days
C)16 days
D)24 days
2
What type of material is used in the dating technique of dendrochronology?
A)tree leaves
B)sediment layers from lake beds
C)tree growth rings
D)key beds
3
A gravel-sized particle in a conglomerate is __________ the conglomerate rock.
A)younger than
B)the same age as
C)always ten times older than
D)older than
4
What method is used to determine the exact age of a rock or fossil?
A)dendrochronology
B)radiometric dating
C)relative age dating
D)the principle of superposition
5
According to the figure, after four half-lives (22,820 years), how much C-14 would be left?
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A)6.25%
B)25%
C)0%
D)10%
6
What isotope is used for finding the age of materials that are organic in origin?
A)carbon-14
B)thorium-232
C)uranium-238
D)potassium-40
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