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Earth is the third planet from the Sun and the only known planet to support life. It has a unique atmosphere rich in oxygen and nitrogen, and about 71% of its surface is covered by water. Earth has one natural satellite, the Moon, which affects tides and stabilizes its rotation. The planet's diverse ecosystems, from oceans to forests, support millions of species. Earth's surface is made up of continents and oceans, shaped by plate tectonics and erosion. It orbits the Sun once every 365 days, creating seasons. Earth's environment is vital for life, but it faces threats from pollution and climate change.