Which of the following events happened first? Earth Day celebrated National Park Service formed World human population reached one billion The term "smog" used for the first time United States Clean Water

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asked Jul 17, 2018 20.5k views

3 votes

Which of the following events happened first?

Earth Day celebrated

National Park Service formed

World human population reached one billion

The term "smog" used for the first time

United States Clean Water Act passed

Advanced Placement (AP)
high-school

Brisi asked

by Brisi

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2 Answers

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The answer is world human population reached one billion.

Jiri Vlasimsky answered Jul 20, 2018

by Jiri Vlasimsky

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4 votes

World human population reached one billion

Fabian Kleiser answered Jul 24, 2018

by Fabian Kleiser

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