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.
Answer:
PLEASE MARK ME BRAINLIEST!
Explanation:
People tend to stay in/out in different types of weather.
The style of clothing changes because of weather.
The sports you play because of weather.
And sometimes your mood can change because of weather.
.....................................................................
Layer G must be older than layer F, according to the law of superposition. So the answer is Paleozoic era, I believe.
