The lake was contaminated with waste from the nearby factory.  - made unclean, containing chemicals, poison, or other harmful substances, I fitted the filter to the tap to remove some of the chemicals - a device that can clean things that pass through it, If drinking water isn't sterile, it can cause stomach problems.  - completely clean or free of germs, The dangerous chemicals were absorbed through tiny pores.  - holes, When you have diarrhea, it's important to drink plenty of water.  - a medical condition that causes stomach pain and frequent production of liquid rather than solid waste, Viruses are typically 20-400 nanometers when measured around the middle..  - one thousand-millionth of a meter,

Keynote Advanced Unit 6

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