magnacycle

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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

Solar eclipse of the sun.

The Sun Was Eaten: 6 Ways Cultures Have Explained Eclipses

Statue of Liberty in front of the skyline of Manhattan, New York City, New York.

Who Was the Woman Behind the Statue of Liberty?

Hemp (Cannabis sativa).

9 Mind-Altering Plants

Venus, view of the northern hemisphere based on observations made by the Magellan spacecraft. The Maxwell Montes, Venus' highest mountain range, is the bright spot just below the center of the image. The Montes, and the dark areas above and to its left,a

5 Weird Facts About Venus

Young boys working in a thread spinning mill in Macon, Georgia, 1909. Boys are so small they have to climb onto the spinning frame to reach and fix broken threads and put back empty bobbins. Child labor. Industrial revolution

The Rise of the Machines: Pros and Cons of the Industrial Revolution

Space race (1957-1969) infographic between United States (U.S.) and Russia. America, Soviet Union, U.S.S.R., space exploration

Timeline of the Space Race, 1957–69

magnacycle

geology

Learn about this topic in these articles:

cyclothems

In cyclothem
…have been referred to as magnacycles. These larger units are of doubtful validity and restricted utility.
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