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SCI. Ch. 2 Sec. 5
Water Underground
| Question | Answer |
|---|---|
| How does water get underground? | it trickles down between particles of soil and through cracks and spaces in layers of rock |
| Pores | different sized spaces |
| How easily water moves through materials depends on what two things? | the size of the pores and how connected each other are |
| Permeable | materials that allow water to easily pass through or permeate |
| Give examples of permeable | sand and gravel |
| impermeable | materials that water cannot pass through easily |
| Give examples of impermeable | clay and granite |
| True or false: once water reaches an impermeable layer it is trapped | true |
| Saturated zone | area of permeable rock or soil that is totally filled, or saturated, with water |
| What tells you how deep you must dig to reach groundwater? | knowing the depth of the water table |
| unsaturated zone | layer of the rocks and soil about the water table |
| Aquifer | any underground layer of rock or sediment that holds water |
| What factors affect how fast water moves in an aquifer? | how steeply the aquifer slopes and how permeable the rocks are |
| How can people obtain groundwater from an aquifer? | by drilling a well below the water table |
| Recharge | new ater that enters the aquifer from the surface |
| artesian well | a well in which water rises because of pressure within the aquifer |
| Springs | groundwater bubbles or flows out or cracks in the rock |
| geyser | type of hot spring from which the water bursts periodically into the air |
| How does a geyser form? | when very hot water that has been circulating deep underground begins to rise through narrow passages in the rock |