River Basin - The area drained by a river and its tributaries, Watershed - The area of land that is drained by a water system, Tributary - Small river or stream that flows into a large river or stream; a branch of the river, 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., Open ocean zone - the area of the ocean beyond the edge of the continental shelf. Most diverse organisms live near the surface., Hydrothermal vents - spots on the ocean floor where hot gases and minerals escape from earth's interior into the water, Plankton - Tiny algae and animals that float in water and are carried by waves and currents, Nekton - free-swimming animals that can move throughout the water column, Benthos - organisms that live on the bottom of the ocean or other body of water; bottom-dwellers, upwelling - the movement of deep, cold, and nutrient-rich water to the surface, Sonar - A device that determines the distance of an object under water by recording echoes of sound waves, Submersible - an underwater vehicle built of strong materials to resist pressure at depth, Terrestrial - term that describes an organism that lives on land, Aquatic - term that describes an organism that lives in water, Autotroph - An organism that makes its own food, Heterotroph - organisms that cannot make their own food and must feed on other organisms for energy and nutrients, Dissolved oxygen - oxygen dissolved in water, Turbidity - a measure of the clarity of the water (how clear is it?) ,

Biology Crossword

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