Disclose a secret or reveal something prematurely, as in You can count on little Carol to spill the beans about the surprise. In this colloquial expression, first recorded in 1919, spill means âdivulge,â a usage dating from the 1500s.
Unformatted text preview: A) S waves travel through solids and P waves travel through liquids. B) P and S waves travel through liquids, but S waves do not travel through solids. C) P waves travel through solids; S waves do not. D) P and S waves travel through liquids, but P waves do not travel through solids.
There are three basic types of seismic waves â P-waves4, S-waves5 and surface waves. P-waves and S-waves are sometimes collectively called body waves. P-waves, also known as primary waves or pressure waves, travel at the greatest velocity6 through the Earth. When they travel through air, they take the form of sound waves â they travel at the speed of sound (330 ms-1) through air but may travel at 5000 ms-1 in granite7. Because of their speed, they are the first waves to be recorded by a seismograph8 during an earthquake.