Answers to Chapter 11 End of Chapter Questions

Answers to Chapter 11 End of Chapter Questions - Answers to...

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Answers to Chapter 11 End of Chapter Questions 1. What conditions are necessary for an artesian well? An artesian well, the water table within the well is located at an elevation above the top of the aquifer. This is due to the increased pressure on the water in the confined aquifer relative to the pressure of the atmosphere in the well. In some cases, confined aquifers will be under pressures high enough that artesian wells will constantly produce water on the earth’s surface without pumping. The conditions necessary for an artesian well include: 1) the well must tap a confined aquifer; 2) the water pressure in the aquifer must exceed the pressure of the overlying atmosphere. More details can be found on pages 289-290 in your textbook. 2. What distinguished a geyser from a hot spring? Why does a geyser erupt? Hot springs are springs in which the water is warmer than a human’s body temperature. Hot springs may boil on occasion if heated to temperatures near or at the boiling point. Geysers are a special type of hot spring which periodically erupts, forming a vertical plume of hot water and/or steam. Geysers erupt because a special combination of vent geometry and heat are present. As shown in Figure 11.27 (page 302), hot boiling water makes it’s way into a subsurface cavern. As boiling occurs, bubbles of steam rise vertically through the cavern and are trapped at a constriction. When enough bubbles collect at the constriction, they rapidly rise vertically through the remainder of the subsurface cavern, forcing the water above the bubbles out of the top of the cavern (the location of the hot spring and geyser at the surface). Removing the cooler water above the boiling water deep underground decreases the pressure on the boiling water deep underground, which allows the boiling water to instantly flash to steam. The great increase in volume as water instantly turns to steam causes great
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This note was uploaded on 04/25/2008 for the course GEOG 102 taught by Professor Hudak during the Spring '08 term at Wisc Oshkosh.

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Answers to Chapter 11 End of Chapter Questions - Answers to...

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