18_groundwater_soil_10_post

18_groundwater_soil_10_post - oundwater, Soil: undwater,...

Info iconThis preview shows pages 1–8. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: oundwater, Soil: undwater, Soil: 1 18: Earths Resources 1 / Groundwater & Soil Springs, Marble Canyon, Grand Canyon National Park, Arizona. Photo: L. Ulrich In the United States, groundwater is the source of most water used for drinking & irrigation oundwater, Soil: undwater, Soil: 2 Importance of groundwater Table E.2 Q1. The majority of liquid, fresh water on Earth exists in ____________. A. clouds B. glaciers C. groundwater C. oceans D. rivers and lakes oundwater, Soil: undwater, Soil: 3 Groundwater and porosity Groundwater resides in open spaces below the ground surface in Groundwater resides in open spaces below the ground surface in either sediment or rock. either sediment or rock. Porosity Porosity : total volume of open space : total volume of open space Porosity includes fractures (cracks) and space between grains Porosity includes fractures (cracks) and space between grains oundwater, Soil: undwater, Soil: 4 Porosity Fig. 19.2 Q2.The porosity of poorly Q2.The porosity of poorly sorted rocks is ___ the sorted rocks is ___ the porosity of well-sorted porosity of well-sorted rocks. rocks. A. higher than A. higher than B. lower than B. lower than C. the same as C. the same as Q3. A. True / B Q3. A. True / B. False: . False: Porosity always decreases Porosity always decreases as grain size of sedimentary as grain size of sedimentary rocks decreases. rocks decreases. Q4. Which rock type has the Q4. Which rock type has the lowest porosity? lowest porosity? A. igneous- low porosity A. igneous- low porosity B. metamorphic- has the B. metamorphic- has the overall lowest overall lowest C. sedimentary C. sedimentary oundwater, Soil: undwater, Soil: 5 Porosity Fig. 19.2 Porosity as Porosity as cementation cementation packing packing sorting sorting # of fractures # of fractures oundwater, Soil: undwater, Soil: 6 Porosity and permeability Permeability Permeability : measure of ease with which : measure of ease with which water moves through ground water moves through ground Porosity: Porosity: moderate moderate Interconnectedness: Interconnectedness: none none Permeability: Permeability: none none Fig. 19.4 Porosity: Porosity: high high Interconnectedness: Interconnectedness: high high Permeability: Permeability: high high Porosity: Porosity: none none Permeability: Permeability: none none oundwater, Soil: undwater, Soil: 7 Porosity and permeability The sketch above shows three samples of sandstone. The pore spaces (gray) between the sand grains (black) are completely filled in with cement. The long, white features are open fractures (cracks). Q5a. Which rock ( A , B, or C) has the greatest porosity?...
View Full Document

Page1 / 35

18_groundwater_soil_10_post - oundwater, Soil: undwater,...

This preview shows document pages 1 - 8. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online