ripple mark

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Planet Earth and lunar moon from space

Where Did the Moon Come From?

Earth from space. Full-hemisphere views of the Earth showing Hurricane Linda at its peak approaching Baja California on 1997 September 11.

What Is Earth’s Velocity?

solar eclipse, sun, moon, astronomy, space

How Do You Tell the Difference Between Total, Annular, Solar, and Lunar Eclipses?

Arrangement of the phases of the moon in total eclipse with Blood Moon

9 Celestial Omens

Solar system illustration. (planets; sun)

Why Are Planets Round?

Discover

jeans, denim, pants, clothing

Why Do We Say “A Pair of Pants”?

The impeachment trial of Pres. Andrew Johnson, illustration from Frank Leslie's Illustrated Newspaper, March 28, 1868.

What If the President Is Impeached?

Prince. musician Prince (Prince Rogers Nelson). Prince WELCOME 2 AMERICA tour. Exclusive North American Performances, 2010-11

7 Celebrities You Didn’t Know Were Inventors

Washington, D.C. locator map.

What State Is Washington, D.C. In?

Dr. Martin Luther King Jr. addresses marchers during his "I Have a Dream" speech at the Lincoln Memorial in Washington. August 28th 1963

Was Martin Luther King, Jr., a Republican or a Democrat?

Martin Luther King, Jr.

Why We Celebrate MLK Day

Alcoholic beverages bottles at Host 2013, international exhibition of the hospitality industry on OCTOBER 18, 2013 in Milan.

Why Is Alcohol Measured by Proof?

ripple mark: Media

geology

Images

ripple mark

ripple mark

Ripple marks in sandstone at Capitol Reef National Park, south-central Utah.

Daniel Mayer

VIEW MORE in these related Britannica articles: