Episode #3: Urvish Singh shares the Earth's story, the third planet from the Sun and the only astronomical object known to harbour life. About 29% of Earth's surface is land consisting of continents and islands. The remaining 71% is covered with water, mostly by oceans, seas, gulfs, and other saltwater bodies and lakes, rivers, and freshwater, which together constitute the hydrosphere. Much of Earth's polar regions are covered in ice. Earth's outer layer is divided into several rigid tectonic plates that migrate across the surface over many millions of years. Earth's interior remains active with a solid iron inner core, a liquid outer core that generates Earth's magnetic field,

Earth's atmosphere consists mostly of nitrogen and oxygen. More solar energy is received by tropical regions than polar regions and is redistributed by atmospheric and ocean circulation. Greenhouse gases also play an important role in regulating surface temperature. A region's climate is determined by latitude and elevation and by proximity to moderating oceans, among other factors. Extreme weather, such as tropical cyclones and heatwaves, occurs in most areas and greatly impacts life.