Waterfalls form through various geological processes, but they all involve water flowing over a sudden drop in elevation.

Rainbow Waterfall, or Waiānuenue, on Hawai'i's Big Island is a natural wonder formed by volcanic activity and the erosive power of the Wailuku River. Its name comes from frequent rainbows created by ...

Waterfalls are furious cascades of water, sometimes scoring the landscapes in which they flow as they obey gravity’s demands. From Iceland’s shimmering Skógafoss to the family of falls in New ...