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Level 5

Drinking water


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