What makes a solid different than a liquid

A solid is different than a liquid because of it's "molecules." A solid molecules aren't moving they are compacting and shaking, while liquid molecules are slowly moving around but aren't compacted together. Also solids are different then liquids because of "shape, and size." Solids have a shape while liquids do not just like how size is different also.

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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.