Is this the correct use of a semicolon?

From the harbors of Africa to the forests of Vietnam, mankind has glorified the most horrid of acts; the practice of murder.

Yes I say it is and instead of horrid shouldn't it be the most horrific.

I'm sorry, but Jenny's answer isn't right.

A semicolon is not the correct punctuation here. A colon is the better punctuation to use. These sites explain the usage of semicolons and colons.

http://www.arts.uottawa.ca/writcent/hypergrammar/semicoln.html

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The word "horrid" isn't the best word to use here, but it is correct.

http://dictionary.reference.com/browse/horrid

I'd prefer "most horrible of acts."

I didn't write the sentence, it's just on a worksheet.

Yes, the use of a semicolon in the given sentence is correct.

A semicolon (;) is used to connect two independent clauses (complete sentences) that are closely related in meaning. In the sentence you provided, the two independent clauses are:

1. "From the harbors of Africa to the forests of Vietnam, mankind has glorified the most horrid of acts."
2. "The practice of murder."

These two clauses could stand alone as separate sentences, but using a semicolon between them helps to show their connection and emphasize the contrast between the geographic locations and the practice of murder.