stream A body of moving water, contained within a bank (sides) and bed (bottom).
swamp A wetland in a low-lying area, where water moves very slowly. Oxygen levels are
often low in swamps.
tributary The smaller of two streams that join together to make a larger stream.
wetland A region of land that holds a great deal of water for significant periods of time,
and that contains specialized plants able to grow in these wet conditions.
Points to Consider
- What types of streams have you seen in your area?
- Why are bodies of water never really permanent?
- Is it possible that your home could be flooded? What would you do if it were flooded?
13.3 Ground Water.
Lesson Objectives
- Define groundwater.
- Explain the location, use, and importance of aquifers.
- Define springs and geysers.
- Describe how wells work, and why they are important.
Introduction
Although lakes and rivers are visible sources of water, did you know that there is water
present underground at almost every spot on Earth? Though this may be surprising, water
beneath the ground is commonplace. It bubbles to the surface at times through springs and
geysers. We also use wells to bring underground water to the surface, so that we can use
this important resource in places where fresh surface water is not readily available.
Groundwater
As you have learned, most of the Earth’s water is found in the oceans, with smaller amounts
in frozen ice caps, and still smaller amounts present in lakes and rivers. Some water is found
in the atmosphere in the form of water vapor or clouds. However the most common place to