contaminants - unwanted substances that dissolve in water, herbicide - toxin intended to kill unwanted plants and weeds, pesticide - toxin intended to kill unwanted animals such as insects, parasites - organisms that get nourishment from attaching to or inside a host, pathogens - disease-causing organisms that can move into water systems from animal waste, sediments - debris such as dirt, silt, and sand that enter the water system, carcinogenic - cancer-causing, oxygen-depleting - removing oxygen that is dissolved in water, desalination - expensive process for removing salt from sea-water, scarcity - lack of available resources, wetlands - areas of land with high water content, such as marshes and swamps, freshwater - water from lakes, rivers and springs that can be safely consumed,

water scarcity and contamination - vocabulary

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