Examlex
The 1987 Montreal Protocol limits the production of CFCs in an attempt to stop depletion of the ozone layer.
Biogeochemical Cycle
A nutrient moves among environmental reservoirs and into and out of food webs.
Earth's Sediments
Particles of organic or inorganic material that have been transported and deposited by wind, water, or ice, forming layers on the Earth's surface.
Biological Components
Essential elements, structures, or molecules that are part of or necessary for the living organisms' life cycles and processes.
Phosphorus
A chemical element, essential for life, involved in many cellular processes, including energy transfer and the structure of DNA and RNA.
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