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Underground layer of rock containing groundwater, which can be extracted using a well or pump.
The process of adding chlorine to a substance, often to water.
Produces fresh drinking water by separating the water from the salts in salty water.
Insoluble substance formed when two soluble substances react together.
The process in which rock grains and insoluble substances sink to the bottom of a liquid.
Using chemical reactions or sensitive machines to identify and measure substances in a sample.