Answer:
The invention of the steam engine and the construction of steel bridges to carry trains across various physical features led to ever-increasing demand for the materials and labor to build more trains and tracks
Explanation:
Chapter 11 AP HUG quiz. Thank me later.
Answer:
This area has been hit by an asteroid, and the land now has a giant hole in it.
Explanation:
The answer is c there you go your welcome
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.
