الموضوع خطييييييير جدا ..... صور .... صور

Quote: Mercury is highly toxic and can cause serious illness and death in humans and animals. Globally, for health and environmental reasons, efforts are being made to reduce the use and release of mercury. Mercury---also known as quicksilver--is an element found in nature in various forms. It is released into the environment through natural processes such as volcanic eruptions, the weathering of rocks, and forest fires.[2, p.11] Mercury is also released through human activities and industrial processes. Because it is an element, mercury does not break down in the environment. Instead, it is cycled between the atmosphere, land, and water, and can travel large distances from the original source[2, p.110]. Mercury can also build up in humans and animals and become highly concentrated in the food chain.[3] This is a problem since low levels of mercury exposure can build up over time until concentrations are high enough to be harmful