In geology, shock waves in solid rock generated by earthquakes or underground explosions. (See seismology.)
Note: Seismic waves travel through the Earth and can be detected far from their source.
Note: Most of our knowledge of the Earth's interior comes from studying seismic waves.
Note: The measurement of seismic waves is also important in detecting underground nuclear tests.
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| an extraordinary or unusual thing, person, or event; an exceptional example or instance. |
| a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question. |