Which atoms and/or ions expand in all directions?

solid and liquid atoms
liquid and gaseous atoms
gaseous atoms and plasmic ions
plasmic ions and solid atoms

Gaseous atoms and plasmic ions expand in all directions.

i believe it would cause an increase of percipitation, though i could be wrong. so i would say b is the answer.

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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.