1) The word "music" contains two vowels: U and I.

2) The Nile River, spanning approximately 6,650 kilometers (4,130 miles), is the longest river in the world. It flows through eleven countries in northeastern Africa, supporting various civilizations throughout history and serving as a vital source of water and transportation.

3) The word "telephone" contains five vowels: E, E, O, E, and E.

4) Cyclones are fueled by warm ocean waters and atmospheric conditions that allow the formation of thunderstorms.