This pesticide pollution diagram depicts the chemicals used to kill or control pests. Herbicides are used to control weeds, insecticides are used to treat fungicides, nematocides are used to control nematodes, and rodenticides are used to treat vertebrate poisoning. Pesticides contain heavy metals such as arsenic, copper sulfates, lead, mercury, oxygen, chlorine, sulfur, phosphorus, nitrogen, and bromine. Pesticides, as toxic chemicals, can disrupt the environment and cause harm in various ways. They run off agricultural lands and domestic gardens where they come into contact with natural resources. This is common when heavy wind or rain falls on the grounds above, spreading the pesticides and making them toxic.