Sounds with frequencies too low for the human ear to hear are called what?

What is work? how much work is done to move an object 0 meters?

The electronic structure or chlorine is 2.8.7 what is the electronic structure of fluorine?

Which is not true of the intertropical convergence zone? a) it features heavy precipitation b) it's where the trade winds collidec) it's a high-pressure zone with sinking air d) it is also known as the doldrums