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the collection and disposal or recycling of waste materials and the monitoring of waste.
a clear, colourless, odourless and tasteless liquid that can also occur as a gas (water vapour)...
(also called a hydrological cycle) the cycle of evaporation and condensation that controls the...
the natural circulation of water on, above or below the surface of the Earth.
the total mass of water retained by certain salts at a given temperature.