Which step in the water cycle involves matter changing form?
a. infiltration
b. precipitation
c. groundwater
d. surface runoff

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what do the different brain waves do?

explanation:

brainwaves are produced by synchronised electrical pulses from masses of neurons communicating with each other. brainwaves are detected using sensors placed on the scalp. brainwave speed is measured in hertz (cycles per second) and they are divided into bands delineating slow, moderate, and fast waves.

c: warm water flows from the western tropical pacific toward south america. that should be the right answer! hope it .