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Wuppertal (German pronunciation: [ˈvʊpɐtaːl] (listen)) is a city in North Rhine-Westphalia, Germany, in and around the Wupper valley, east of Düsseldorf and south of the Ruhr. With a population of approximately 350,000, it is the largest city in the Bergisches Land. Wuppertal is known for its steep slopes, its woods and parks, and its suspension railway, the Wuppertal Schwebebahn. It is the greenest city in Germany, with two-thirds green space of the total municipal area. From any part of the city, it is only a ten-minute walk to one of the public parks or woodland paths.
In the 18th and 19th centuries, the Wupper valley was one of the largest industrial regions of continental Europe.
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Earth is the third planet from the Sun and the only astronomical object known to harbor life. About 29% of Earth's surface is land consisting of continents and islands. The remaining 71% is covered with water, mostly by oceans but also lakes, rivers and other fresh water, 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, and a convecting mantle that drives plate tectonics.
According to radiometric dating estimation and other evidence, Earth formed over 4.5 billion years ago. Within the first billion years of Earth's history, life appeared in the oceans and began to affect Earth's atmosphere and surface, leading to the proliferation of anaerobic and, later, aerobic organisms. Some geological evidence indicates that life may have arisen as early as 4.1 billion years ago. Since then, the combination of Earth's distance from the Sun, physical properties and geological history have allowed life to evolve and thrive. In the history of life on Earth, biodiversity has gone through long periods of expansion, occasionally punctuated by mass extinctions.
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