Entries starting with W
- Warsaw: Capital Rebuilt From RuinsWarsaw is the capital and largest city of Poland, home to about 1.86 million people, almost entirely rebuilt after World War II.
- Washington, D.C.: History, Geography, Culture and Key FactsWashington, D.C. is the U.S. federal capital on the Potomac River, planned around the National Mall and the Washington Monument.
- Water cycleThe water cycle is the continuous movement of Earth's water between the ocean, the atmosphere, the land surface and underground stores.
- WavelengthWavelength is the distance from one wave crest to the next, and it decides whether light is a radio wave, visible color or gamma ray.
- Wellington: New Zealand’s Windy Capital on Cook StraitWellington is the capital city of New Zealand, built around a sheltered harbour at the southern tip of the North Island.