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100

An opening bored into the zone of saturation.
What is a well?

100

Rock or soil through which groundwater moves easily.
What is an aquifer?

100

The movement of surface water into rock or soil through cracks and pore spaces.
What is infiltration?

100

The course the water in a stream follows.
What is a stream channel?

100

A measure of a material’s ability to transmit fluids.
What is permeability?

200

A stream that empties into another stream.
What is a tributary?

200

A flow of groundwater that emerges naturally at the ground surface.
What is a spring?

200

A form of limestone that is deposited by hot springs or as a cave deposit.
What is travertine?

200

The part of a stream’s load of solid material that is made up of sediment too large to be carried in suspension.
What is bed load?

200

Zone where all open spaces in sediment and rock are completely filled with water.
What is the zone of saturation?

300

The upper level of the saturated zone of groundwater.
What is the water table?

300

A hot spring or fountain that ejects water at various intervals.
What is a geyser?

300

A naturally formed underground chamber or series of chambers most commonly produced by solution activity in limestone.
What is a cavern?

300

Water underground in the zone of saturation.
What is groundwater?

300

The maximum load a stream can carry. It is directly related to a stream’s discharge.
What is capacity?

400

The volume of open spaces in rock or soil.
What is porosity?

400

The volume of water flowing past a certain point in a given unit of time.
What is discharge?

400

A depression produced in a region where soluble rock has been removed by groundwater.
What is a sinkhole?

400

The slope or steepness of a stream channel. Usually expressed as the vertical drop of a stream over a certain distance.
What is gradient?

400

The lowest point to which a stream can erode its channel.
What is base level?

500

The unending circulation of Earth’s water supply.
What is the water cycle?

500

Water naturally rises above the level of the water table.
What is an artesian well?

500

An area that has a land surface or topography with numerous depressions called sinkholes.
What is karst topography?

500

A stream in a broad, flat-bottomed valley that is near its base level often develops a course with many bends in it.
What is meanders?

500

Plants absorb water and release it into the atmosphere.
What is transpiration?