Which of these best explains why Earth’s tectonic plates move? Convection currents in the asthenosphere make fluid particles move.
Cooling causes contraction and shifting of the fluid particles in the lithosphere. Cooling causes expansion and shifting of the fluid particles in the asthenosphere. Convection currents in the lithosphere make fluids move in a circular motion.

Wavelength = pie*69+69 with ur mom

This question is incomplete and not physics but i'm  willing to if you can give a better question

Sounds propagates through some kind of medium. usually it's air, but it goes just as well through solid objects like walls, windows etc. a soundwave will compress the (air)molecules in front of it, and if this increased density wave hits your ears, you register it as sound. solid objects like walls are a lot denser than air, this means that they will damp a wave, but also carry it easier.