1) The blue whale is the largest animal to have ever existed, with an average length of about 82 feet (25 meters).

2) Many mountains have cultural and spiritual significance for local communities and are often considered sacred or revered in religious traditions.

3) The ozone layer, located in the Earth's stratosphere, protects us from harmful ultraviolet (UV) radiation.

4) Cyclones, also known as hurricanes or typhoons, are powerful tropical storms characterized by low-pressure centers and strong winds.