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Relative And Radioactive Dating
Test Description: Relative and Radioactive Dating
Instructions: Answer all questions to get your test result.
1) The geological processes that shape Earth's features today ____.
A
did not operate in the distant past
B
became important only several hundred years ago
C
are much different than thousands of years ago
D
are basically the same as they were in the geologic past
2) According to the principle of cross-cutting relationships, an intrusive rock body is ____.
A
older than the rocks it intrudes
B
always made of the same materials as rock around it
C
deposited as sedimentary layers
D
younger than the rocks it intrudes
3) In general, the law of superposition states that in an undeformed sequence of sedimentary rocks, each layer is ____.
A
thicker than the one above it
B
older than the one below it
C
basically the same age
D
older than the one above it
4) If the half-life of an unstable isotope is 10,000 years, and only 1/8 of the radioactive parent remains in a sample, how old is the sample?
A
30,000 years old
B
10,000 years old
C
20,000 years old
D
40,000 years old
5) Atoms with the same atomic number but different mass numbers are called ____.
A
neutrons
B
ions
C
protons
D
isotopes
6) The time it takes for 50% of the nuclei in a radioactive sample to decay to its stable isotope is called ____.
A
the half-life
B
the half-time
C
geologic time
D
the daughter product
7) In living things, what is the source of the carbon-14 that is used in radiocarbon dating?
A
carbon dioxide in water
B
carbon dioxide in rocks
C
carbonic acid in caves
D
carbon dioxide in the atmosphere
8) Radiocarbon dating could be used to date which of the following?
A
15-million-year-old lava flow
B
60,000-year-old mammoth bone
C
60,000-year-old metamorphic rock
D
65-million-year-old meteorite
9) When the nucleus of an atom decays spontaneously, it's called:
A
relative dating
B
radioactivity
C
deposition
D
erosion
10) Radiometric dating is possible because the rates of decay of radioactive isotopes ____.
A
are constant
B
change from place to place
C
vary widely
D
change over time
*select an answer for all questions
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