1) The word "mountain" contains three vowels: O, U, and A.

2) The Super Bowl is the championship game of the National Football League (NFL) in the United States and is one of the most-watched television events each year.

3) The concept of compound interest can be attributed to the ancient Babylonians, who used it in their banking practices.

4) Oceans play a crucial role in regulating the Earth's climate by absorbing and storing large amounts of heat and carbon dioxide.