1 Allergic reactions and sensitivities to certain foods may cause a canker sore to develop. Allergic reaction to certain types of bacteria found in the mouth may also result in this type of mouth ulcer.  Celiac disease sufferers may experience canker sores.
One of the biggest sources is called nonpoint source pollution, which occurs as a result of runoff. Nonpoint source pollution includes many small sources, like septic tanks, cars, trucks, and boats, plus larger sources, such as farms, livestock ranches, and timber harvest areas.ne of the biggest sources is called nonpoint source pollution, which occurs as a result of runoff. Nonpoint source pollution includes many small sources, like septic tanks, cars, trucks, and boats, plus larger sources, such as farms, livestock ranches, and timber harvest areas.
Industrial pollution has reached even the most remote corners of Earth: the deepest part of the sea. Industrial pollution has reached even the most remote corners of Earth: the deepest part of the sea. Scientists have discovered extraordinary levels of polychlorinated biphenyls, or PCBs, in the Mariana and Kermadec trenches, two of the deepest ocean chasms on the planet.