All About Earth Earth, the third planet from the Sun, is a fascinating celestial body that plays a crucial role in sustaining life as we know it. With a diameter of approximately 12,742 kilometers, Earth is the largest of the terrestrial planets in our solar system. One of the most remarkable features of Earth is its diverse and vibrant ecosystems. From lush rainforests to vast deserts, our planet is home to a wide array of plant and animal species. These ecosystems provide essential resources, such as clean air, water, and food, which support the intricate web of life. Earth's atmosphere is composed mainly of nitrogen (78%) and oxygen (21%), with trace amounts of other gases. This mixture of gases creates a protective layer that shields the planet from harmful solar radiation and regulates its temperature, making it habitable for living organisms. Another defining characteristic of Earth is its hydrosphere, which consists of oceans, seas, lakes, rivers, and other bodies of water...