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.