How+can+Petroleum+poison?

=Why is it a poison? = If you have any skin contact with-petroleum or petroleum containing product it may cause illness or death, especially of wild animals. Petroleum may defeat animals with very small doses. Petroleum can poison grass and soil if any chemicals have been used or stored there. Also water can contain those chemicals, which is extremely dangerous because all the living organisms depend on water. Petroleum is also can be bad for people if they eat it, or drink it, or breath it in and etc. 