〰️//〰️

#counterpoint #independent lines #interweaving #parallel motion #separate threads #simultaneous development

🌍〰️↔️

#seismic p-wave #primary wave #earthquake wave #geophysics #earth wave #parallel motion

⚫️⚫️⚫️·⚫️·⚫️⚫️⚫️➡️

#compression wave #rarefaction #particle density #wave propagation #parallel motion

↔️//➡️

#parallel motion #oscillation direction #wave direction #physics definition #wave mechanics