<span>Factories and their corresponding jobs were located in cities and created economic opportunities for migrants.</span>
The U.S. has more than 87,000 dams greater than six feet high (and two million overall). While many dams continue to provide benefits such as flood control, irrigation, and water supply, for other dams the cost of maintenance or the negative effects on communities, fish, and tribes justifies their removal.
Dam owners and regulators decide whether to remove a dam by weighing many factors including: the cost of removal and the ability to replace any lost power generation against avoided long-term maintenance; safety concerns; benefits to endangered fish populations; increased recreational and commercial fishing; and restoration of cultural values of nearby tribes.
By 2020, roughly 70% of dams will be more than 50 years old, inviting us to reconsider the value to the public of long-term investments in this infrastructure.
Here is an example! Hope it helps
Answer:
1.A fertile area in desert where water is found.
2.This circular geologic feature is thought to be caused by an uplifted dome-geologist would classify it as a domed anticline-that has been eroded to expose the originally flat rock layers.
