1) The process of nuclear fusion powers the sun and other stars, fusing hydrogen atoms together to form helium and releasing vast amounts of energy in the process.

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

3) Cricket, originating in England, is a popular sport played in many countries and is known for its distinctive rules and terminology.

4) The novel "To Kill a Mockingbird" by Harper Lee has been translated into more than 40 languages and has sold over 40 million copies worldwide.