environmental infrastructure

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water purification plant

wastewater-treatment plant

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airplane in flight (plane, aircraft, flying)

7 Puzzling Plane Disappearances

Scolex (head) of the tapeworm Taenia solium. The hooks of the scolex enable the tapeworm to attach to the intestinal wall.

Uninvited Guests: The 7 Worst Parasitic Worms

African Americans demonstrating for voting rights in front of the White House as police and others watch, March 12, 1965. One sign reads, "We demand the right to vote everywhere." Voting Rights Act, civil rights.

Timeline of the American Civil Rights Movement

Time zone map with standard time zones and International Date Line

Why Are Some Time Zones 30 Minutes Off Instead of an Hour?

Demystified - Do Lemmings Really Commit Mass Suicide? illustration

Do Lemmings Really Commit Mass Suicide?

Dancers at a Cinco de Mayo festival at the Mission District, San Francisco, California. (Photo dated 2019.) holidays

Is Cinco de Mayo Mexico's Independence Day?

New York NY/ USA- November 23, 2018 Hordes of shoppers throng the Macy's Herald Square flagship store in New York looking for bargains on the day after Thanksgiving, Black Friday.

Why Is It Called Black Friday?

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water purification plant

wastewater-treatment plant

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environmental engineering water supply system waste disposal pollution control wastewater treatment solid-waste management air pollution control hazardous-waste management emissions trading carbon offset construction tunnels and underground excavations harbours and sea works bridge canals and inland waterways road dam surveying lighthouse ship construction