PLEASE HELP !
What do forms of mechanical energy have in common?

Which statement accurately describes the relationship between air pressure, air density, or altitude? as altitude increases, pressure increases.as altitude increases, air density increases.air pressure and density are lowest at sea level.denser air exerts more pressure than less dense air.

What type of reaction fuels the processes seen here?

What best discribes the relationship between wavelength and frequency in a electromagnetic wave