Section #: 21.3
Absolute-Age Dating of Rocks
Practice Test
1.
What type of material is used in the dating technique of dendrochronology?
SC.D.1.4.3
a.
tree leaves
b.
key beds
c.
tree growth rings
d.
sediment layers from lake beds
Hint
2.
What isotope is used for finding the age of materials that are organic in origin?
SC.D.1.4.3
a.
potassium-40
b.
carbon-14
c.
thorium-232
d.
uranium-238
Hint
3.
According to the figure, after four half-lives
22,820 years
, how much C-14 would be left?
SC.D.1.4.3
a.
25%
b.
0%
c.
10%
d.
6.25%
Hint
4.
A gravel-sized particle in a conglomerate is __________ the conglomerate rock.
SC.D.1.4.3
a.
younger than
b.
always ten times older than
c.
older than
d.
the same age as
Hint
5.
What method is used to determine the exact age of a rock or fossil?
SC.D.1.4.3
a.
dendrochronology
b.
radiometric dating
c.
relative age dating
d.
the principle of superposition
Hint
