Question

select the appositive or appositive phrase. george perkins marsh, one of the first environmentalists in the united states, condemned the detrimental effects of the industrial revolution on the american landscape.

Explanation:

An appositive is a noun or noun - phrase that renames another noun right beside it. In the given sentence, "one of the first environmentalists in the United States" renames "George Perkins Marsh".

Answer:

one of the first environmentalists in the United States