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deep, narrow holes drilled into the earth to reach the ground water in aquifers.
waste water from sinks, washing machines, dishwashers, showers and baths, which can be used for...
minerals and vitamins that are taken as nutritional supplements to regular food (in the form of...
small fluid-filled spaces in the matrix of bone and cartilage in which cartilage and bone cells...
(also called radioactive dating) a method of measuring the age of fossils based on how much...