What pollution does scrap metal have to the environment?

Pollution to soil: scrap metal will destroy the acid-base balance of soil and affect the quality of soil; Water pollution: a large number of heavy metals and other substances are brought into the water and infiltrated into the soil, and the accumulated pollution has caused serious harm to the ecological environment; Pollution to the living environment of animals and plants: destroying the living environment of animals and plants and adversely affecting biodiversity; Pollution to crops: Heavy metals discarded in natural batteries, such as mercury, will slowly overflow from the batteries, enter the soil or water, and then enter the human body through crops, damaging people's kidneys.