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2 天前 · Phosphorus is a chemical element; it has symbol P and atomic number 15. Elemental phosphorus exists in two major forms, white phosphorus and red phosphorus, but because it is highly reactive, phosphorus is never found as a free element on Earth. It has a concentration in the Earth's crust of about one gram per kilogram (compare copper at about ...
3 天前 · In mathematics, the Fibonacci sequence is a sequence in which each number is the sum of the two preceding ones. Numbers that are part of the Fibonacci sequence are known as Fibonacci numbers, commonly denoted Fn . The sequence commonly starts from 0 and 1, although some authors start the sequence from 1 and 1 or sometimes (as did Fibonacci ...
2 天前 · Africa. Africa is the world's second largest and second-most populous continent after Asia. At about 30.3 million km 2 (11.7 million square miles) including adjacent islands, it covers 20% of Earth 's land area and 6% of its total surface area. [7] With 1.4 billion people [1] [2] as of 2021, it accounts for about 18% of the world's human ...
1 天前 · The native Polish name for Poland is Polska. The name is derived from the Polans, a West Slavic tribe who inhabited the Warta River basin of present-day Greater Poland region (6th–8th century CE). The tribe's name stems from the Proto-Slavic noun pole meaning field, which in-itself originates from the Proto-Indo-European word *pleh₂-indicating flatland.
3 天前 · The Lapis Niger, probably the oldest extant Latin inscription, from Rome, c. 600 BC during the semi-legendary Roman Kingdom The earliest known form of Latin is Old Latin, also called Archaic or Early Latin, which was spoken from the Roman Kingdom, traditionally founded in 753 BC, through the later part of the Roman Republic, up to 75 BC, i.e. before the age of Classical Latin.
3 天前 · Amazon.com, Inc.,[1] doing business as Amazon (/ˈæməzɒn/, AM-ə-zon; UK also /ˈæməzən/, AM-ə-zən), is an American multinational technology company, engaged in e-commerce, cloud computing, online advertising, digital streaming, and artificial intelligence.[5] It is considered one of the Big Five American technology companies; the ...
1 天前 · Composite satellite image of Antarctica (2002) Apollo 4 photograph with Antarctica at top, 1967 Antarctica (/ æ n ˈ t ɑːr k t ɪ k ə / ) is Earth's southernmost and least-populated continent.Situated almost entirely south of the Antarctic Circle and surrounded by the Southern Ocean (also known as the Antarctic Ocean), it contains the geographic South Pole.
