Term
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Definition
| combined mass of water found on, under, and over the surface of the earth. Most is in oceans the other3% is Glacier and groundwater |
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Term
| What is the majority of fresh water on the earth? |
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Definition
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Term
| How does most groundwater exist within the subsurface? |
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Definition
| within the small open spaces between the grains of rocks and sediments |
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Term
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Definition
| amount of open space within rock |
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Term
| High porosity v low porosity |
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Definition
high- lots of poor space
low- very little open space |
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Term
| Where is porosity usually highest and if it is poorly sorted what is its porosity like? |
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Definition
| Highest porosity is in sedimentary rocks, and poorly sorted=low porosity |
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Term
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Definition
the degree of connectivity between pore spaces
To be permeable posre spaces are connected to each other, water can move through permeable materials easily |
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Term
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Definition
| impermeable mean the poor spaces are not well connected so material barriers the water flow |
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Term
| What are characteristics of permeabilty and porosity? |
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Definition
Permeability- highest in sediments and sedimentary rocks if poorly sorted it is low
permeability- it is high in COARSE sed./sed. rocks, also has to do with geometry of pores and cracks. |
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Term
| So can a rock have high porosity and low permeability |
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Definition
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Term
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Definition
| zone in which pores are completely filled with water |
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Term
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Definition
| soil and rock near the surface in which pores are filled primarily with air and some water |
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Term
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Definition
| Boundary between saturated and unsaturated |
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Term
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Definition
hole in ground
water exchanges with groundwater (indicated height of water table) |
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Term
| Are water tables flat? why or why not? |
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Definition
| No, its eleveation roughly mimics the land surface |
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Term
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Definition
| earth materials with high porosity and permeability that hold a lot of water in their poor spaces (sand gravel sandstone and limestone are common) |
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Term
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Definition
| earth materials with low porosity and permeability that hold little water |
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Term
| Why do we have to drill so many wells? |
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Definition
| aquifer rock properties vary from place to place, to extract groundwater from differnt rock formations, not enough water for us from surface water sources |
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Term
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Definition
| water that is stuck over an impermeable section above the regional(regular) water table |
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Term
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Definition
| water table drops and land sinks (arizona) |
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