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2 天前 · Tibet is the highest region on Earth, with an average elevation of 4,380 m (14,000 ft). [1] [2] Located in the Himalayas, the highest elevation in Tibet is Mount Everest, Earth's highest mountain, rising 8,848.86 m (29,032 ft) above sea level. [3] The Tibetan Empire emerged in the 7th century.
2 天前 · Dymaxion map of the world with the 30 largest countries and territories by area This is a list of the world's countries and their dependencies by land, water, and total area, ranked by total area.Entries in this list include, but are not limited to, those in the ISO 3166-1 standard, which includes sovereign states and dependent territories.
2024年4月9日 · The Navier–Stokes equations ( / nævˈjeɪ stoʊks / nav-YAY STOHKS) are partial differential equations which describe the motion of viscous fluid substances. They were named after French engineer and physicist Claude-Louis Navier and the Irish physicist and mathematician George Gabriel Stokes. They were developed over several decades of ...
1 天前 · Princeton University is a private Ivy League research university in Princeton, New Jersey. Founded in 1746 in Elizabeth as the College of New Jersey, Princeton is the fourth-oldest institution of higher education in the United States and one of the nine colonial colleges chartered before the American Revolution.[8][9][a] The institution moved ...
3 天前 · Central limit theorem. In probability theory, the central limit theorem ( CLT) states that, under appropriate conditions, the distribution of a normalized version of the sample mean converges to a standard normal distribution. This holds even if the original variables themselves are not normally distributed.
2 天前 · Renewable energy, green energy, or low-carbon energy is energy from renewable resources that are naturally replenished on a human timescale. Renewable resources include sunlight, wind, the movement of water, and geothermal heat.[1][2][3][4][5][6][7][excessive citations] Although most renewable energy sources are sustainable, some are not. For ...
5 天前 · Demographics of Earth. Population pyramid of the world in 2022 by the UN. Population. Over 8,000,000,000 (estimated) Fertility rate. 2.27 (2021) Earth has a human population of over 8 billion as of 2024, with an overall population density of 50 people per km 2 (130 per sq. mile). Nearly 60% of the world's population lives in Asia, with almost 2 ...
