These chemicals can enter the soil and rock, polluting the aquifer and eventually the well.

The film documents interviews with scientists who believe these toxins may be working to cause cancer, and shows how chemicals enter the bodies of humans.

The separated chemicals then leave the tube, one at a time, and enter the other part of the analyzer: a mass spectrometer.

These chemicals enter the atmosphere, where they remain for many decades, combining with and destroying ozone molecules.

The fishermen say the chemical entered the fishes' food chain in the spawning grounds.

If you suspect chemicals have entered your eye, begin flushing it immediately with cool water and continue to do so for approximately 15 minutes.

The chemical then enters the food chain through worms and tiny creatures that live on lake bottoms.

When a hazardous chemical enters the environment, it can harm people's health.

Ms. Applebaum said she was not sure whether the rules would ensure that absolutely no pharmaceuticals or industrial chemicals entered food.

The chemicals entered the atmosphere or leaked into the streams.