Soil Contamination
Soil covers most of the surface of the Earth’s land. It occurred after the erosion of rocks, due to strong winds, water, ice and due to the activity of living organisms. Soil is usually suitable for plants and small organisms to grow and live. However, human activities have altered the natural soil environment of many areas, making it hostile to organisms.
Humanity deposits many toxic substances under the ground. Most of those are radioactive materials, pesticides, heavy metals and other kind of poisonous wastes. Even if they are first deposited in lakes, rivers or the sea, waters transfer most of them in the soil, when the latter absorbs water. It happens the other way round as well, as chemicals within soil are transferred with the rain into marine ecosystems.
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