The geological processes that shape Earth's features today ____.

According to the principle of cross-cutting relationships, an intrusive rock body is ____.

In general, the law of superposition states that in an undeformed sequence of sedimentary rocks, each layer is ____.

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?

Atoms with the same atomic number but different mass numbers are called ____.

The time it takes for 50% of the nuclei in a radioactive sample to decay to its stable isotope is called ____.

In living things, what is the source of the carbon-14 that is used in radiocarbon dating?

Radiocarbon dating could be used to date which of the following?

When the nucleus of an atom decays spontaneously, it's called:

Radiometric dating is possible because the rates of decay of radioactive isotopes ____.

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