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Why is it that some areas never flood?. Aim: How is groundwater movement affected?. Topic: Water Cycle and Climates Main Idea: Porosity. 1) Does groundwater move?. Yes, groundwater moves very slowly through the layers of rock, more slowly through clay. 2) Define porosity?.
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Aim: How is groundwater movement affected? Topic: Water Cycle and Climates Main Idea: Porosity
1) Does groundwater move? • Yes, groundwater moves very slowly through the layers of rock, more slowly through clay.
2) Define porosity? • It is the percentage of empty space in a rock (how “holey” it is).
2) How does porosity affect groundwater movement? • The higher the porosity, the faster the movement of the groundwater.
3) What factors affecting porosity? • A) shape of particles • B) the sorting • C) their arrangement (packing) • D)particle size • E) cracks • F) cementation
Porosity Porosity Roundness well sorted Poorly sorted Porosity Loosely packed Tightly packed
Which has the greatest porosity? • If the shape, sorting and packing remain the same the size of the particles can’t change the porosity.
Porosity Particle Size
What other factors might change the porosity? • A) Cracks more cracks= higher porosity • B) Cementation the cement fills in the pores and decreases the porosity
