What causes the downward movement movements of air?

5points ! is potential chemical energy always transformed into kinetic

Arod of some material 0.20 m long elongates 0.20 mm on heating from 21 to 120°c. determine the value of the linear coefficient of thermal expansion [in (degrees c)^-1] for this material.

Wavelength,frequency,and energy are related.what happens to a wave as it’s wavelength gets shorter?