1) Elvis Presley, often referred to as the "King of Rock and Roll," has sold over one billion records worldwide.

2) Mountains are important water sources, as they capture and store precipitation, feeding rivers and supporting ecosystems downstream.

3) The signing of the Magna Carta in 1215 laid the foundation for modern democratic principles and limited the powers of the monarchy in England.

4) The Indian Ocean is the third-largest ocean and is characterized by its warm waters and diverse marine life.