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It is commonly used as a unit of time to denote length of time before the present in 10 9 years. This initialism is often used in the sciences of astronomy , geology , and paleontology . The "billion" in bya is the 10 9 "billion" of the short scale of the U.S. , [ 1 ] not the long-scale 10 12 "billion" of some European usage.
Conventional abbreviations for US cities and states: for example, "New York" can indicate NY and "California" CA or CAL. The abbreviation is not always a short form of the word used in the clue. For example: "Knight" for N (the symbol used in chess notation)
In standard form, it is written as 1 × 10 9. The metric prefix giga indicates 1,000,000,000 times the base unit. Its symbol is G. One billion years may be called an eon in astronomy or geology. Previously in British English (but not in American English), the word "billion" referred exclusively to a million millions (1,000,000,000,000). However ...
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An American-style 15×15 crossword grid layout. A crossword (or crossword puzzle) is a word game consisting of a grid of black and white squares, into which solvers enter words or phrases ("entries") crossing each other horizontally ("across") and vertically ("down") according to a set of clues. Each white square is typically filled with one ...
The three most important standards of the ancient Greek monetary system were the Attic standard, based on the Athenian drachma of 4.3 grams (2.8 pennyweights) of silver, the Corinthian standard based on the stater of 8.6 g (5.5 dwt) of silver, that was subdivided into three silver drachmas of 2.9 g (1.9 dwt), and the Aeginetan stater or didrachm of 12.2 g (7.8 dwt), based on a drachma of 6.1 g ...
Astronomers have detected one of the most distant and energetic mysterious fast radio bursts in space, a millisecond-long blast of radio waves that traveled 8 billion years to reach Earth.
The earliest evidence for life on Earth includes: 3.8 billion-year-old biogenic hematite in a banded iron formation of the Nuvvuagittuq Greenstone Belt in Canada; [30] graphite in 3.7 billion-year-old metasedimentary rocks in western Greenland; [31] and microbial mat fossils in 3.48 billion-year-old sandstone in Western Australia. [32] [33 ...