water diversion

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After a perfect launch, spectators try to catch a last glimpse of Space Shuttle Columbia, barely visible at the top end of the twisted column of smoke.

7 Accidents and Disasters in Spaceflight History

Common, or southern, cassowary (Casuarius casuarius).

8 Birds That Can’t Fly

Moonrise over Tucson, Arizona

Why Doesn’t Arizona Observe Daylight Saving Time?

Bar graph of the United States Death Toll during major events. Infogram chart.

U.S. Death Toll During Major Events

Groups of depositors in front of the closed American Union Bank, New York City. April 26, 1932. Great Depression run on bank crowd

Causes of the Great Depression

Close up of periodic table, focus on nickel, copper, zinc, palladium, silver, cadmium

When Was the Periodic Table Invented?

Amendments 1-10 to the Constitution of the United States constitute what is known as the Bill of Rights on an American flag.

What Is the Emoluments Clause?

water diversion

hydrology

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contour farming

In contour farming
cropping, terracing, and water diversion.
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