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The troposphere is the lowest layer of Earth's atmosphere. It extends from Earth's surface to an average height of about 12 km (7.5 mi; 39,000 ft), although this altitude varies from about 9 km (5.6 mi; 30,000 ft) at the geographic poles to 17 km (11 mi; 56,000 ft) at the Equator, [23] with some variation due
Moon's orbital distance from Earth 10 9: 1 gigameter 1.39 Gm Diameter of the Sun: 5.15 Gm Greatest mileage ever recorded by a car (3.2 million miles by a 1966 Volvo P-1800S) [38] 10 10: 10 Gm: 18 Gm Approximately one light-minute: 10 11: 100 Gm: 150 Gm 1 astronomical unit (au); mean distance between Earth and Sun 10 12: 1 terameter (Tm) 1.3 Tm
Later, in 1920, French-Polish linguist Jean Przyluski found that Mường is more closely related to Vietnamese than other Mon–Khmer languages, and a Viet–Muong subgrouping was established, also including Thavung, Chut, Cuoi, etc. [12] The term "Vietic" was proposed by Hayes (1992), [13] who proposed to redefine Viet–Muong as referring to ...
The ISS maintains an orbit with an average altitude of 400 kilometres (250 mi) [12] and circles the Earth in roughly 93 minutes, completing 15.5 orbits per day. [ 13 ] The ISS programme combines two prior plans to construct crewed Earth-orbiting stations: Space Station Freedom planned by the United States, and the Mir-2 station, planned by the ...
The first airline was the German airship company DELAG, founded on November 16, 1909. [1] The four oldest non-airship airlines that still exist are the Netherlands' KLM (1919), [ 2 ] Colombia's Avianca (1919), [ 3 ] Australia's Qantas (1920) [ 4 ] and the Russian Aeroflot (1923).
Earth Hour is a worldwide movement organized by the World Wildlife Fund (WWF). The event is held annually, encouraging the individuals, communities, and businesses to give an hour for Earth, and additionally marked by landmarks and businesses switching off non-essential electric lights, for one hour from 8:30 to 9:30 p.m., usually on the last Saturday of March, as a symbol of commitment to the ...
Antarctica is the coldest, windiest, and driest of Earth's continents. [1] Near the coast, the temperature can exceed 10 °C in summer and fall to below −40 °C in winter. Over the elevated inland, it can rise to about −30 °C in summer but fall below −80 °C in winter.
As of 2020, the global sex ratio is approximately 1.01 males to 1 female. [72] Approximately 24.7% of the global population is aged under 15, while 65.2% is aged 15–64 and 10.1% is aged 65 or over. [72] The median age of the world's population is estimated to be 31 years in 2020, [9] and is expected to rise to 37.9 years by 2050. [73]