How do mountains affect the climate of a region?

Which wave is the result of amplification and produces a louder sound

If frequency goes down, what happens to wavelength? does it get shorter or longer?

Research and discuss the aurora borealis in terms of electric charges, magnetic fields, and forces. which times of the year are best for seeing the northern lights, and where are the best places to view them? explain your answers. also identify links to good images. if you’ve ever seen the aurora borealis, describe your experience and note the time and place that you saw it.