Relative And Radioactive Dating: Question Preview (ID: 5942)

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The geological processes that shape Earth's features today ____.
a) are basically the same as they were in the geologic past b) are much different than thousands of years ago c) did not operate in the distant past d) became important only several hundred years ago
According to the principle of cross-cutting relationships, an intrusive rock body is ____.
a) younger than the rocks it intrudes b) deposited as sedimentary layers c) always made of the same materials as rock around it d) older than the rocks it intrudes
In general, the law of superposition states that in an undeformed sequence of sedimentary rocks, each layer is ____.
a) older than the one above it b) older than the one below it c) thicker than the one above it d) basically the same age
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) 20,000 years old c) 40,000 years old d) 10,000 years old
Atoms with the same atomic number but different mass numbers are called ____.
a) isotopes b) protons c) ions d) neutrons
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 daughter product c) the half-time d) geologic time
In living things, what is the source of the carbon-14 that is used in radiocarbon dating?
a) carbon dioxide in the atmosphere b) carbon dioxide in rocks c) carbon dioxide in water d) carbonic acid in caves
Radiocarbon dating could be used to date which of the following?
a) 60,000-year-old mammoth bone b) 65-million-year-old meteorite c) 15-million-year-old lava flow d) 60,000-year-old metamorphic rock
When the nucleus of an atom decays spontaneously, it's called:
a) radioactivity b) relative dating c) erosion d) deposition
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
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