Question

which of the following eventually resulted in niagara falls love canal neighborhood being declared a federal emergency in 1978?
oil drilling in the area had destroyed its ecosystem.
a neighborhood there had been built over a toxic dump.
a large amount of iron, zinc, and lead mining had poisoned the water supply.
there had been an accident at a nearby nuclear power plant.

Explanation:

The Love Canal incident in 1978 was due to a neighborhood being built over a toxic dump. Chemicals from the dump leaked, causing health - related issues and environmental problems, leading to the federal emergency declaration.

Answer:

A neighborhood there had been built over a toxic dump.