EXPRESSION IS ABOUT

Francis Picabia,  Je revois en souvenir ma chère Udnie , 1914. JOHN WRONN, THE MUSEUM OF MODERN ART/©2016 ARTISTS RIGHTS SOCIETY (ARS), NEW YORK, AND ADAGP, PARIS/THE MUSEUM OF MODERN ART, NEW YORK, HILLMAN PERIODICALS FUND

How do hurricanes form? Share: Tweet Hurricane Fran. Image made from GOES satellite data. Hurricanes are the most violent storms on Earth. People call these storms by other names, such as typhoons or cyclones, depending on where they occur. The scientific term for all these storms is  tropical cyclone . Only tropical cyclones that form over the Atlantic Ocean or eastern Pacific Ocean are called "hurricanes." Whatever they are called, tropical cyclones all form the same way. Tropical cyclones are like giant engines that use warm, moist air as fuel. That is why they form only over warm ocean waters near the equator. The warm, moist air over the ocean rises upward from near the surface. Because this air moves up and away from the surface, there is less air left near the surface. Another way to say the same thing is that the warm air rises, causing an area of lower air pressure below. A cumulonimbus cloud. A tropical cyclone has so many

YOU MIGHT ALSO LIKE Pictures Reveal Hurricane Matthew's Destruction in Haiti How Much Do You Really Know About Hurricanes? U.S. Hasn't Gone This Long Without a Big Hurricane in 150 Years   WATCH: Hurricanes are massive storms with deadly force. Find out how they form, and what's being done to better predict their impact. By  National Geographic Staff PUBLISHED  OCTOBER 6, 2016 Every year, coastal regions brace themselves for violent windstorms known as hurricanes. But how do these storms form and grow? The oversimplified answer: Warm ocean water plus the Earth’s eastward rotation. “They’re heat engines,” said meteorologist Jeff Masters of the website Weather Underground  in a  previous interview . “They take heat from the oceans and convert it to the energy of their winds. They’re taking thermal energy and making mechanical energy out of it.” The