1. Groundwater Water found underground in the cracks and spaces in soil, sand and rock. Question: How does water collect underground? Use the terms permeable and impermeable in your answer.

2. Permeable A substance that liquids can flow through. Soil, sand and gravel are permeable because there are spaces between the particles. Question: Why can permeable ground hold water?

3. Impermeable A substance that liquids cannot flow through. Rocks such as granite are impermeable. Question: Why does impermeable ground not able to hold water?

4. Aquifer An underground layer of permeable rock or sediment that contains water. Question: How does an aquifer form? (Hint: use page 26C in your textbook.)

5. Water Table The top of the area underground that is saturated, or completely filled with water. Question: If you were on the surface in the pictures below, how far down would you have to dig to get water? Use water table in your answer.

6. Divide A ridge, or continuous line of high land that separates drainage basins. Question: If drainage basin was a bowl what would the divide be?

7. Drainage Basin or Watershed An area into which all of the water on one side of a divide flows. The water collected in the watershed seeps into the ground or flows downstream into rivers, streams, and lakes. Question: When it rains, how does the water flow and collect in a drainage basin?