### water:

Ground water
* Most ground water is discharged from the aquifer by underflow, withdrawal, and evapotranspiration
  - found in aquifers
* Some ground water finds openings in the land surface and emerges as freshwater springs
  - is more susceptible to contamination because of the soils and rock composition
* accumulates chiefly from rain that filters through the soil.
* behaves much like surface water in that it flows from high areas to lower areas.
* can be, and has been, contaminated by human activities
  - become unusable if it becomes polluted and is no longer safe to drink
  - carry additional radon into homes and other buildings, creating a health risk
  - contain hydrogen sulfide or other naturally occurring chemicals
  - enter cracked or broken pipes bringing any number of contaminants with it
  - move across state boundaries
  - pop through sediment patches on the sea floor or through freshwater springs
* carries nutrients from the forest's decaying leaves and needles out to the marsh
  - with it anything it picks up
* comes from underground aquifers and wells.
* contains only tiny amounts of dissolved nutrients.
* creates hydrostatic pressure on basement walls and floors.
* dissolves minerals like calcium carbonate and gypsum from the soil and rock.
* erodes the limestone little by little, forming caves of varous size.
* exists in pores between particles in subsurface sediment or rock units.
* feeds wells and springs.
* fills the sinkholes in limestone areas.
* flows downstream, or toward nearby lakes and rivers
  - from areas where the water table is elevated towards areas where it is lower
  - toward and along the axis of the Gila River
* is affected by agricultural and urban land uses.
* is also a potential source for irrigation
  - at risk from nonpoint source pollutants as they enter the state's aquifers
  - the source of much of the water used for irrigation
* is an excellent water source that requires little purification
  - extremely important resource in North Dakota
* is an important source of drinking water in every State
  - surface water and nutrients
* is an important source of water for irrigation and drinking water supplies
  - supply in Illinois
  - particularly in arid regions of the west
  - indispensable part of our ecological system
  - cleaned by a natural filter as it flows through underground soils
  - commonly less contaminated and more useful than surface water
  - considered a renewable resource unless it is used faster than it can be replenished
  - contained in aquifers, which are layers of bedrock saturated with water
* is contaminated with acids and organic compounds
  - benzene
  - naphthalene, methylene naphthalene, and dibenzofuran
  - crucial to sustaining streamflow for habitat and for water supply
  - discharged from the ground into streams and rivers
  - drawn upward by evaporation at the surface
  - essential to our everyday lives
* is found in soils and sands able to retain the water - much like a sponge holds water
  - spaces between soil particles and rocks, and within cracks of bedrock
  - the pores and cavities of rocks beneath the earth's surface
  - under ground in rock formations called aquifers
  - heated in underground reservoirs to form naturally occurring hot water and steam
  - less likely to be contaminated than surface water
  - limited and usually occurs at great depths
  - never completely pure
  - obtained from wells and springs that are open to aquifers
* is one of Alaska's least understood natural resources
  - Florida's most important natural resources
  - the most precious natural resources in South Dakota
  - plentiful but is affected by salt in many places near the coast
  - present in virtually all landscapes
* is simply water that fills pores or cracks in subsurface rocks
  - flows beneath the earth's surface
  - so high, water stands anywhere there hole more than a few inches deep
* is stored in aquifers
  - naturally below the Earth's surface
  - within the pore spaces of aquifers
* is the island's only source of drinking water
  - main water source for rural households
  - major water source in Warren County, serving virtually all households
  - one that feeds rivers and springs during the dry season
* is the primary drinking water source for half of the state's population
  - water source for much of western Kansas
  - single source of drinking water on the island
  - sole source of drinking water for many rural communities and some larger cities
* is the source of drinking water for over half of the U.S. population
  - high-quality drinking water for most of the state's communities
  - underground water that feeds our streams and water supply wells
* is the water below the surface within the earth that supplies wells and springs
  - present underground in the tiny spaces in rocks and soil
* is the water that fills cracks and other openings in beds of rocks and sand
  - the pores in sands or gravel or the cracks in fractured rocks
  - is found beneath the earth's surface
  - soaks into the ground
  - underground water where all the pores in the soil are filled
* is used by animals for bathing
  - local industries
* is used for agricultural, domestic, industrial, and commercial purposes
  - domestic, irrigation, industrial, and agricultural purposes
  - in irrigation, industry, domestic households and for maintaining livestock
* is used to irrigate crops and supply homes, businesses, and industries with water
  - supplement precipitation
  - very difficult to clean up
* is water beneath Earth's surface, often pumped for drinking water
  - the surface of the earth
  - found in pores or cracks in sand, gravel, and rock beneath the land surface
  - in the saturated zone
  - occurring in the zone of saturation in an aquifer or soil
  - that flows underground through permeable soil and rock, often under pressure
* is water that has been seeped and stored into the ground
  - gone through the turbines of a hydro-electric plant
  - sinks into the upper portion of the Earth's surface
* lives in the geology.
* major water source for rural households in Crawford County.
* natural resource, but it fairly finite one.
* occurs almost everywhere beneath the land surface
  - especially in permeable fractures and weathered zones
* occurs in both the glacial deposits and bedrock
  - geologic formations called aquifers
  - many different types of soil and rock strata
  - predominantly under unconfined, secondary-permeability conditions
  - under both artesian and nonartesian conditions in southeastern Florida
* oozing through underwater sediment banks can also cause slumping.
* percolates downward, comes in contact with the hot rock and is heated.
* poses a danger of corroding containers holding the radioactive waste.
* principal natural resource of Reno County.
* provides a vast supply of water for use in agriculture, homes, and industry
  - most of the drinking water in the islands
  - the total flow in the rivers and creeks when there is no rain or snowmelt
* pumping by humans causes land subsidence, which causes a change in the vegetation.
* reappears at the earth's surface as springs, seeps in wells.
* safe, economic and environmentally friendly resource.
* serves as a large subsurface water reservoir.
* significant source of drinking water for tribal communities in Arizona.
* travels through permeable soil on top of hard or impermeable layers.
* vast resource that underlies the earth's surface.
* vital link in the water cycle.