Groundwater contains high levels of salt minerals is the largest available source of freshwater is only found in very wet climates is only used to supply the public with drinking water

It is the largest available source of freshwater.

Groundwater is the reservoir of water, that accumulates in the underground zone of the soil profile. The water seeps into the underground by tiny pores present in the aggregates of the soil. The water from sources like lakes, river, ponds, rainfall and irrigation of agricultural land absorbed by the soil in the form of groundwater. It is the largest available source of freshwater.

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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.