Answer:
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Radar because the waves are reflected back off of the source so with the reflection it's hard for them to see earth surface.
<span>tierra helada and the puna.
tierra fría.
tierra templada.
<span>tierra caliente.</span></span>
This is why S-waves arrive as secondary waves at the Earth's surface. There is another importantdifference between P-waves and S-waves. Although both can pass through solid rock, only P-waves can also pass through gases and liquids.
Pacific,arctic, and atlantic oceans