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Gold is a chemical element with the symbol Au (from the Latin word aurum) and the atomic number 79. In its pure form, it is a bright, slightly orange-yellow, dense, soft, malleable, and ductile metal. Chemically, gold is a transition metal, a group 11 element, and one of the noble metals. It is one of the least reactive chemical elements ...
The golden ratio's negative −φ and reciprocal φ−1 are the two roots of the quadratic polynomial x2 + x − 1. The golden ratio is also an algebraic number and even an algebraic integer. It has minimal polynomial. This quadratic polynomial has two roots, and. The golden ratio is also closely related to the polynomial.
- 1.10011110001101110111...
- 1.9E3779B97F4A7C15...
- 1.618033988749894...
This is a list of the oldest living people who have been verified to be alive as of the dates of the cited supporting sources. It was estimated in 2015 that between 150 and 600 living people had reached the age of 110. The true number is uncertain, as not all supercentenarians are known to researchers at a given time, and some claims cannot be validated or are fraudulent.
- Development
- Details
- Richter Magnitudes
- Magnitude Empirical Formulae
- External Links
Prior to the development of the magnitude scale, the only measure of an earthquake's strength or "size" was a subjective assessment of the intensity of shaking observed near the epicenter of the earthquake, categorized by various seismic intensity scales such as the Rossi-Forel scale. ("Size" is used in the sense of the quantity of energy released,...
The Richter scale was defined in 1935 for particular circumstances and instruments; the particular circumstances refer to it being defined for Southern California and "implicitly incorporates the attenuative properties of Southern California crust and mantle." The particular instrument used would become saturated by strong earthquakes and unable to...
The Richter magnitude of an earthquake is determined from the logarithm of the amplitude of waves recorded by seismographs (adjustments are included to compensate for the variation in the distance between the various seismographs and the epicenterof the earthquake). The original formula is: 1. M L = log 10 A − log 10 A 0 ( δ ) = log 10 [ A / ...
These formulae for Richter magnitude ML are alternatives to using Richter correlation tables based on Richter standard seismic event (M L = 0 {\displaystyle M_{\mathrm {L} }=0} , A = 0.001 m m {\displaystyle A=0.001\mathrm {mm} } , D = 100 k m {\displaystyle D=100\mathrm {km} } ). Below, Δ {\displaystyle \textstyle \Delta } is the epicentral distan...
Seismic Monitor – IRIS ConsortiumPerspective: a graphical comparison of earthquake energy release – Pacific Tsunami Warning CenterBitcoin (abbreviation: BTC; sign: ) is the first decentralized cryptocurrency. Nodes in the peer-to-peer bitcoin network verify transactions through cryptography and record them in a public distributed ledger, called a blockchain, without central oversight. Consensus between nodes is achieved using a computationally intensive process based on proof of work, called mining, that guarantees the ...
Vincent Leonard Price Jr. (May 27, 1911 – October 25, 1993) was an American actor, art historian, art collector, and gourmet cook. He appeared on stage, television, and radio, and in more than 100 films. Price has two stars on the Hollywood Walk of Fame, one for motion pictures and one for television.[1] Price's first film role was as a ...
Earth Day is an annual event on April 22 to demonstrate support for environmental protection. First held on April 22, 1970, it now includes a wide range of events coordinated globally by EARTHDAY.ORG (formerly Earth Day Network)[1] including 1 billion people in more than 193 countries.[2][1][3] The official theme for 2024 is "Planet vs ...
