Cohesion - The tendency of water molecules to stick to each other, Adhesion - The tendency of water to stick to other substances, Density - The amount of matter in a given space; mass per unit volume, River Basin - The area drained by a river its tributaries, Groundwater - Water that fills the cracks and spaces in underground soil and rock layers, Aquifer - Underground bed or layer yielding ground water for wells and springs etc, Estuary - The area where a freshwater stream or river merges with the ocean. Often a nursery for young., Plankton - Tiny algae and animals that float in water and are carried by waves and currents, Benthos - Organisms that live on the bottom of the ocean or other body of water; bottom-dwellers, SONAR - A device that determines the distance of an object under water by recording echoes of sound waves, Terrestrial - Term that describes an organism that lives on land, Aquatic - Term that describes and organism that lives in water, Autotroph - An organism that makes its own food, pH - A measure of how acidic or basic a solution is, Nitrates - Nitrogen compounds used for growth by plants and algae, Molecule - Two or more atoms held together by bonds, Period - Horizontal row on the Periodic Table, Magnetism - Attraction between opposite poles, Solubility - The ability to dissolve in another substance, Volume - The amount of space something occupies,

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