1. Groundwater

2. Aquifers
-An aquifer is where groundwater is held in large quantities within material’s pore spaces. -Water table is the highest level of water in an aquifer.

3. Porosity and Permeability
- Porosity is the percentage of pore space in rock material.
•Shape and size determine the space. Well-sorted material has higher porosity.
- Permeability is the rate (cm/sec) that water can move through rock material.

6. Geysers and hot springs

7. Accessing Groundwater

8. Groundwater Use

9. Ogallala Aquifer

10. Soil Texture Greater than 2 mm = gravel/stones 0.05 – 2 mm = sand
0.002 – 0.05mm = silt
Less than mm = clay