The United States 3 (Fill in the Blank)
*coal*
Power plants and factories that burn _ and oil have caused acid rain.
*earthquakes*
Powerful _ in recent years have caused serious damage in Los Angeles, San Francisco, and Seattle.
*Florida*
Fertilizers used in sugarcane fields in the state of _ have killed plants and wildlife in The Everglades.
*gentrification*
In some urban areas younger professionals have been buying run-down housing and restoring them, a process known as:
*Snake*
In the West, dams on the Columbia and _ Rivers produce hydroelectricity, but they also block the path of migrating salmon.
*Colorado*
So much water is now drawn from the _ River that almost none reaches the Gulf of California.
*United States*
The _ consumes more energy than any other country in the world and produces huge amounts of pollutants.
*flooding*
The greatest danger posed by hurricanes is _.
*Northeast*
The populations of some large cities have dropped significantly in recent years, particularly in the _ region.
*superpower*
When the Soviet Union collapsed in 1991 the United States became the world's only _ , which is a huge powerful country.