What are "the shadow zones" and why do they exist?Correct. Funny, it's about 0.98889 radians.
Correct, your turn!Shadow zones are regions on Earth's surface which seismic waves from a given epicenter cannot reach. The S-wave shadow zone is anywhere past 104 deg and the P-wave shadow zone is between 104 deg and 140 deg. They occur because of the curving refraction of the seismic waves as they travel through the Earth's mantle and core (generally speed of sound increases as you go deeper). S-waves are stopped at the outer core, but P-waves can travel through. However, because the speed of sound in the outer core is slower, P-waves are refracted as they enter it.
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