Watersheds - Geosystems
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22 Terms
What is groundwater?
The source of drinking water for about 1/3 of Virginia’s population.
Where does groundwater occur?
In the voids between the soil and rock particles.
What is an aquifer?
The formation in which groundwater is located.
From what pressure does water come up?
It’s own pressure.
What is proposity?
A measurement of how much of a rock is open space.
Where can the porosity space be?
Between grains or within cracks or cavities of the rock.
Put the soil particle sizes in order least to greatest
Clay, Silt, Sand, Gravel.
What is permeability?
A measurement of the ability of a rock or sediment to transmit water or other liquids.
Permeability is what stone?
Sandstone.
Where is a substantial amount of water stored?
In permeable soil and rock underground.
How old may groundwaters in deep aquifers be?
10,000 years old.
How old is groundwater within ½ mile of the surface?
About 200 years old.
What is topography?
Shape of the land.
The level of the water table changes with what?
The topography.
What happens when a pump takes water out faster than it can be replaced?
The water table level drops near the wall pipe.
What can negatively impact groundwater?
Geological processes; erosion
Human activities; waste disposal
Leaks from UST’s
What is chemical pollution?
When chemicals can flow either on top of or within the groundwater, depending on its density.
What’s something that influences groundwater flow?
Pumping wells.
What is a watershed?
An area or ridge of land that separates waters flowing to different rivers, basins, or seas.
Whats the difference between a watershed and a river sysyem?
A river system is a river and all of its tributaries, while a watershed is the land that drains onto a river system.
What 3 water places does Virginia’s major watershed system lead to?
Chesapeake Bay
NC sounds
Gulf of MEXICO
What is estuary? (4 things)
Where fresh and saltwater meet (brackish water)
Breeding grounds for many organisms
Naturally filter water
Transition zone between river and ocean environments