think about the rain shadow effect. explain how the earth’s systems (spheres) are interacting.
hydrosphere:
biosphere:
geosphere:
atmosphere:

well, The hydrosphere is moving water to provide life for the biosphere. The geosphere is blocking the rain from the hydro and atmosphere from producing life past where it is blocking, so, in essence, the hydrosphere is "moved" into the atmosphere, where it drops onto the geosphere, creating the possibility for life in the biosphere everywhere that is not being "bullied" for lack of better term by the mountains blocking rain.

I hope this helps!

a=c and then d= c because of the band so you get ac/dc and you add them together you get sound waves