Final answer:
The sentence is a declarative sentence and the subject is 'The threat of earthquakes'
Step-by-step explanation:
The sentence 'The threat of earthquakes is increasing in western North Carolina' is a declarative sentence.
A declarative sentence is a type of sentence that makes a statement or expresses a fact. It ends with a period.
In this sentence, the subject is 'The threat of earthquakes', which refers to the potential danger of seismic activity in western North Carolina.
Learn more about sentence type