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APSC 151 Week 4 Questions And Answers
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biofuel ~ - Ethanol produces CO2 when its burned - Switch grass is considered carbon negative (absorbs CO2 as it grows) - It is essential that non-food crops are used in ethanol production - Recent advances indicate that algae may be used as a source renewables ~ - A wide variety of renewable...

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  • August 5, 2024
  • 27
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • apsc 151 week 4 questions and answers

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  • APSC 151
  • APSC 151

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APSC 151 Week 4 Questions
And Answers

surface water


✓✓✓✓~ 0.3% of fresh water

- Surface water is found in runoff, lakes, ponds, swamps, streams and rivers




glacial water


✓✓✓✓~ 76% of fresh water

- Not renewable


- Melting into oceans (lost)


- Original source of most current surface water resources on earth




groundwater


✓✓✓✓~ 24% of fresh water

- Groundwater is water found in the pores of soil and sediment, plus narrow

fractures in bedrock


- Largest reservoir of fresh water that is readily available to humans

,water table


✓✓✓✓~ The upper level of the saturated zone of groundwater

- where groundwater is at zero pressure




zone of aeration


✓✓✓✓~ Above the water table

- Water cannot be pumped by wells




zone of saturation (phreatic zone)


✓✓✓✓~ zone where all open spaces in sediment and rock are completely filled with water

- Water within this zone is called "groundwater"




porosity of ground


✓✓✓✓~ Determines storage capacity for water

- primary porosity: in sand and rocks


- secondary porosity: in fractures and caverns




aquitard

, ✓✓✓✓~ An impermeable layer that hinders or prevents water movement (such as clay or
unjointed rock)




aquifer


✓✓✓✓~ permeable rock strata or sediment that transmits groundwater freely (such as sand
and gravels)




exposed soil or sediment


✓✓✓✓~ At depth the pore space between grains would be filled with water

- A well in this rock has a screen to allow water to flow from the soil to the well


- The water table is the height of water in the well after reaching a static level

(no flow)




exposed fractured rock


✓✓✓✓~ At depth these joints would be filled with water

A well in this rock intersects and drains the fractures


There is no underground "pool"




Porosity


✓✓✓✓~ - Percentage of total volume of rock or sediment that consists of pore spaces

- how much groundwater can be stored

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