Short Summary

The Earth covers 510 million square kilometers, consisting of 29 percent land and 71 percent water. Formed from the ancient supercontinent Pangaea through continental drift, the lithosphere is divided into seven distinct continents: Asia, Africa, North America, South America, Europe, Oceania, and Antarctica. These landmasses feature diverse topographies, climates, and populations, with Asia being the largest and most populous. The hydrosphere contains five interconnected oceans characterized by complex floors including continental shelves, slopes, and deep trenches. Today, the world is politically divided into 197 countries, varying vastly in total land size, natural environments, and socio-economic advancement.