1. Where does your drinking water come from?
Today’s Objective: Where Is Groundwater and How Does It Reach The Surface?
Do Now:
Where does your drinking water come from?

2. What is the Water Table? Zone of Aeration
pore space contains mostly air
Zone of Saturation
pore space contains mostly water
Water Table

3. * The GW moves more slowly when the pore spaces are smaller.*
Groundwater is the water within the zone of saturation and moves through pore spaces.
* The GW moves more slowly when the pore spaces are smaller.*

4. Aquifer – permeable rock layers or sediments that transmit groundwater freely.

5. Springs - form when the water table intersects the ground surface.
Hot Springs
- Water is heated by cooling of igneous rock.

6. Geysers – a fountain of water and stream which shoots up from the ground

7. A well is a hole into the zone of saturation.
a) An artesian well occurs when groundwater rises on its own under pressure.
b) Pumping can cause a drawdown (lowering) of the water table.
c) Pumping can form a cone of depression in the water table.

8. a) Formed when groundwater bonds with carbon dioxide and forms carbonic acid which dissolved some rocks like Limestone (Chemical Weathering)
Karst Topography
b) Forms caves
c) A common surface feature are sinkholes

9. Groundwater Contamination
Groundwater is considered a NATURAL RESOURCE
Groundwater Contamination
- Overuse and contamination threatens groundwater supplies in some areas.
Treating it as a nonrenewable resource.
Land subsidence (sinking) caused by its withdrawal.

10. http://www.youtube.com/watch?v=nGkDouBVoLs – sinkholes
– old faithful