Question

multiple choice question
how do primary waves affect particles inside earth?
they cause particles to move back and forth in the same direction that the waves are traveling.
they cause the particles to move perpendicular to the direction that the waves are traveling.
they cause particles to move in an up - and - down rolling motion.

Explanation:

Primary waves, also known as P - waves, are compressional waves. In a compressional wave, the particles of the medium move back and forth in the same direction that the wave is traveling. This is a fundamental property of P - waves in the context of seismic wave behavior within the Earth.

Answer:

They cause particles to move back and forth in the same direction that the waves are traveling.