Tidal range Tidal range Tidal range is the height difference between high tide and low tide. Tides are the rise and fall of sea levels caused by gravitational forces exerted by the Moon and Sun and the rotation of Earth. Tidal range is not constant but changes depending on the locations of the Moon and Sun. The most extreme tidal range occurs during spring tides, when the gravitational forces of both the Moon and Sun are aligned (syzygy), reinforcing each other in the same direction (new moon) or in opposite directions (full moon). During neap tides, when the Moon and Sun's gravitational
What Are You Going to Do to Help the Boys? What Are You Going to Do to Help the Boys? "What Are You Going to Do to Help the Boys?" is a World War I era song released in 1918. Gus Kahn wrote the lyrics. Egbert Van Alstyne composed the music. It was published by Jerome H. Remick & Co. of Detroit, Michigan. Artist E.E. Walton designed the sheet music cover. It features Uncle Sam inside a red, white, and blue question mark. He is holding his beard and looking down at liberty bonds. To the left of this image it reads, "Buy a Liberty Bond!" on some editions. The