Earth - Wikipedia
Earth is rounded into an ellipsoid with a circumference of about 40,000 km. It is the densest planet in the Solar System. Of the four rocky planets, it is the largest and most massive. Earth is about eight light-minutes away from the Sun and orbits it, taking a year (about 365.25 days) to complete one revolution.
Earth | Definition, Size, Composition, Temperature, Mass, & Facts ...
3 天之前 · Learn about Earth, the third planet from the Sun and the only place known to harbour life. Explore its structure, composition, atmosphere, climate, history, and more from Britannica's experts.
World Map / World Atlas / Atlas of the World Including Geography …
Well-researched and entertaining content on geography (including world maps), science, current events, and more.
Geography - Wikipedia
Geography is the study of the Earth and its features, phenomena, and interactions. Learn about the history, methods, and key concepts of geography, as well as its main branches: human, physical, and technical geography.
Planet Earth facts and information - National Geographic
Learn about Earth's features, layers, atmosphere, and climate, and how they support life and protect us from space. Find out how Earth compares to other planets and why it's unique.
Facts About Earth - NASA Science
Learn about Earth's size, distance, orbit, rotation, seasons, moon, and more from NASA. Find out how Earth is unique among the planets and why it is the only place we know of with life.
Earth - NASA Science
NASA's Earth Information Center allows visitors to see how our planet is changing in six key areas: sea level rise and coastal impacts, health and air quality, wildfires, greenhouse gases, sustainable energy, and agriculture.
Geography | Definition, Types, History, & Facts | Britannica
2024年8月21日 · Geography is the study of the diverse environments, places, and spaces of Earth’s surface and their interactions. Learn about the history, methods, and applications of geography, as well as its branches and subfields, such as physical geography.
Planet Earth - WorldAtlas
Thus, the Earth’s shape can best be described as an oblate spheroid, with an average diameter of 12,742 kilometers. The Earth is about 510 million square kilometers, of which only 29.2% is …
Geography and its subfields | Britannica
geography, Science of the Earth’s surface, which describes and analyzes the spatial variations in physical, biological, and human phenomena that occur on the surface of the globe and treats …