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Earth's Water

Water Cycle

TermDefinition
hydrologic cycle movement of water in the Earth system
condensation the change in water's state of matter from a gas to liquid
transpiration the release of water vapor by plants into the atmosphere
evaporation occurs when liquid water turns into water vapor
runoff runs downhill towards oceans, lakes, and marshlands
sublimation when solid water (ice) changes directly to water vapor without becoming a iquid
infiltration some of the water on land seeps into the ground
groundwater water that's underground
surface water all the bodies of freshwater, salt water, ice, and snow that are found above the ground
water table the upper surface of the underground water; the upper boundary of the zone of saturation
channel the path that a stream flows
tributary a stream that flows into a lake or larger stream
watershed the area of land that is drained by a river system
divide the boundary between drainage areas that have streams that flow in opposite directions
aquifer a body of rock or sediment that stores groundwater and allows the flow of groundwater
porosity the percentage of rock that is composed of pore space (space between material)
permeability the measure of how easily water flows through an aquifer
water pollution waste or other material introduced into water and is harmful to organisms that live in, drink, or are exposed to the water
point source pollution pollution that comes from one location and when found can be controlled
non point source pollution comes from many small sources and can be difficult to control
chemical pollution when harmful chemicals are added to water supplies
biological pollution when live or dead organisms are added to water supplies that might have disease causing microbes
thermal pollution the heating of a body of water caused by human activity that has a harmful effect on water quality and that water’s ability to support life
eutrophication an increase in the amount of nutrients in water
potable water that is safe to drink
reservoir a body of water that forms behind a dam
Created by: pendletons
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