Examlex
Arsenic in the drinking water is not a concern in the United States.
Nonbiological Reservoirs
Natural or artificial environments that do not involve living organisms, which can store various substances or elements.
Biogeochemical Cycles
Natural pathways by which essential elements or compounds move through the biosphere, lithosphere, atmosphere, and hydrosphere.
Carbon
A chemical element with symbol C, capable of forming many compounds including carbon dioxide and organic molecules.
Atmosphere
The layer of gases surrounding a planet or celestial body, gravitationally bound to it, and essential for many life forms.
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