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an international agreement to phase out the use of CFCs, signed by 49 countries in Montreal, Canada, in 1987.
a perforated wall or part of a wall at the end of one of the individual cells making up a sieve...
the seepage of acidic, contaminated water from disused mines and mine dumps.
primitive type of fish that lives very deep underwater and has four leg-like fins. It is thought...
biological, chemical, or physical agent that stimulates a characteristic function or causes a...
the inner region of the kidney, striped in appearance, made up of renal pyramids.