Seismic waves are known as earthquake waves. There are types of seismic waves. Primary waves, Secondary waves and Surface waves. Primary waves also called P-waves) travel the fastest of all the waves. They are unique in the aspect that they travel through all states of matter solid, liquid, and gas. P-waves are considered push-pull waves. They push and pull the rock on the contrary, secondary waves (also called as S-waves) are not as fast as P- waves. They cannot travel through liquid or gas. S-waves travel in a side-to- side motion Surface waves (also called as L-waves) are the slowest wave. They move along the earth's surface similar to the way waves travel in the ocean, up and down. They are the most destructive wave because of the danage they create directly on to the earth's surface. As the waves reach the core, one kind of seismic wave (S-wave) disappears. That means that the outer core is liquid. Seismic Wave Another Name Speed Motion Type of Material it travels Primary Wave 1. 2. 3. Solid, Liquid and Gas the the S-wave 5. 6. Average speed L-wave 8. Earth's Surface Up and down an. from Questions 1. What type of wave that cannot travel through liquid and gas? Explain briefly nd is gain 2. Why is surface wave the most destructive type of seismic wave?

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