1) The human body contains enough carbon to make over 9,000 pencils.

2) The development of the World Wide Web Consortium (W3C) and web standards has ensured interoperability and compatibility across different web browsers and devices.

3) Mountains are formed through various geological processes, including tectonic plate movements, volcanic activity, and erosion.

4) The Mona Lisa, painted by Leonardo da Vinci, is one of the most famous and valuable artworks in the world.